From 933c0389b811878e0653cccf3c98ace2efed4207 Mon Sep 17 00:00:00 2001
From: Ben Sharafian <ben@sharafian.me>
Date: Wed, 7 Mar 2018 04:53:56 -0800
Subject: [PATCH] feat: use btp plugin (#23)

---
 .gitignore                              |    2 +
 README.md                               |   58 +-
 circle.yml                              |    2 +-
 index.js                                |  751 +++---
 package-lock.json                       | 3051 +++++++++++++----------
 package.json                            |   20 +-
 store-wrapper.js                        |   32 +
 test/channelSpec.js                     |  456 ----
 test/integration/rippled-integration.js |  160 +-
 test/pluginSpec.js                      |  384 +++
 test/scripts/test.js                    |   89 +
 11 files changed, 2735 insertions(+), 2270 deletions(-)
 create mode 100644 store-wrapper.js
 delete mode 100644 test/channelSpec.js
 create mode 100644 test/pluginSpec.js
 create mode 100644 test/scripts/test.js

diff --git a/.gitignore b/.gitignore
index 91fa8cf..6c71859 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,4 @@
 /node_modules/
+/coverage/
+/.nyc_output/
 npm-debug.log
diff --git a/README.md b/README.md
index e1a3138..cec06a3 100644
--- a/README.md
+++ b/README.md
@@ -1,56 +1,52 @@
 # ilp-plugin-xrp-paychan
 
 Uses payment channels on ripple to do fast ILP transactions between you and a
-peer.  Current in-flight payments are at risk (your peer can choose not to give
-you claims for them), but if the amount in-flight exceeds your `inFlightLimit`,
-you won't acknowledge incoming transfers until you're paid.
+peer. Current in-flight payments are at risk (your peer can choose not to give
+you claims for them), but are secured against the ledger as soon as you get a
+claim.
 
-**Warning: This plugin is still in a development state, and should not be used with
-live accounts.**
+**Warning: This plugin is still in a development state.**
 
 # Example
 
 This is how to instantiate a plugin:
 
 ```js
-const PluginRipple = require('ilp-plugin-xrp-paychan')
+const PluginXrpPaychan = require('ilp-plugin-xrp-paychan')
 const Store = require('ilp-plugin-payment-channel-framework/test/helpers/objStore')
 
-const plugin = new PluginRipple({
-  // This is the server that ripple-lib submits transactions to.  You can
-  // configure this to point at the altnet or to point at the live net.
-  rippledServer: 'wss://s.altnet.rippletest.net:51233',
+const plugin = new PluginXrpPaychan({
 
-  // Your ripple address and secret
-  address: 'r33L6z6LMD8Lk39iEQhyXeSWqNN7pFVaM6',
-  secret: 'ssyFYib1wv4tKrYfQEARxGREH6T3b',
+  // If you want your peer to connect to you as a ws client (which doesn't
+  // change the nature of the liquidity relationship) set the `listener`
+  // argument in the constructor.
+  listener: {
+    port: 666,
+    secret: 'its_a_secret' // this is the token that your peer must authenticate with.
+  },
 
-  // The peer you want to start a payment channel with
-  peerAddress: 'rhxcezvTxiANA3TkxBWpx923M5zQ4RZ9gJ',
+  // If you wish to connect to your peer as a ws client, specify the server option.
+  // You may specify both the server and client options; in that case it is not deterministic
+  // which peer will end up as the ws client.
+  server: 'btp+ws://:its_a_secret@localhost:666',
 
-  // limit of how much can be owed in-flight to you at once before you stop
-  // accepting more incoming transfers. (in XRP drops)
-  maxUnsecured: '50000',
+  // Specify the server that you submit XRP transactions to.
+  xrpServer: 'wss://s.altnet.rippletest.net:51233',
 
-  // how much to fund your payment channel. (in XRP drops)
-  maxAmount: '10000000',
+  // XRP address and secret
+  secret: 's...',
+  address: 'r...',
 
-  // highest balance allowed
-  maxBalance: 'Infinity',
+  // Peer's XRP address
+  peerAddress: 'r...',
 
-  // Our peer's BTP server address.
-  server: 'btp+ws://alice:password@mypeer.example',
-
-  // store is used to keep local state, which is necessary because the plugin
-  // works based on off-chain payment channel claims. `get`, `put`, and `del`
-  // are asynchronous functions for accessing a key-value store. See
-  // https://github.com/interledger/rfcs/blob/master/0004-ledger-plugin-interface/0004-ledger-plugin-interface.md#class-pluginoptions
+  // Store in which to save claims and channel details. This will be passed in
+  // automatically if you're using the ILP connector.
   _store: new Store()
 })
 
 plugin.connect().then(() => {
   // do something with your plugin
+  return plugin.sendData(/* ... */)
 })
 ```
-
-For an example of how to send a payment refer to [examples/send-payment.js](https://github.com/ripple/ilp-plugin-xrp-paychan/blob/master/examples/send-payment.js).
\ No newline at end of file
diff --git a/circle.yml b/circle.yml
index e8f39ba..b9378db 100644
--- a/circle.yml
+++ b/circle.yml
@@ -2,7 +2,7 @@ machine:
   services:
     - docker
   node:
-    version: 7.7.1
+    version: 8.9.4
 
 dependencies:
   pre:
diff --git a/index.js b/index.js
index 18ef7ea..1350a4a 100644
--- a/index.js
+++ b/index.js
@@ -1,500 +1,409 @@
 'use strict'
 
 // imports
+const debug = require('debug')('ilp-plugin-xrp-paychan')
+const BtpPacket = require('btp-packet')
 const { RippleAPI } = require('ripple-lib')
-const addressCodec = require('ripple-address-codec')
-const { makePaymentChannelPlugin } = require('ilp-plugin-payment-channel-framework')
-const uuid = require('uuid')
+const { deriveAddress, deriveKeypair } = require('ripple-keypairs')
+const PluginBtp = require('ilp-plugin-btp')
 const nacl = require('tweetnacl')
-const crypto = require('crypto')
-const bignum = require('bignum') // required in order to convert to buffer
 const BigNumber = require('bignumber.js')
-const assert = require('assert')
-const { ChannelWatcher } = require('ilp-plugin-xrp-paychan-shared')
+const StoreWrapper = require('./store-wrapper')
+const {
+  ChannelWatcher,
+  util
+} = require('ilp-plugin-xrp-paychan-shared')
 
 // constants
 const CHANNEL_KEYS = 'ilp-plugin-xrp-paychan-channel-keys'
-const DEFAULT_REFUND_THRESHOLD = 0.9
-const {
-  DEFAULT_WATCHER_INTERVAL,
-  STATE_NO_CHANNEL,
-  STATE_CREATING_CHANNEL,
-  STATE_CHANNEL,
-  POLLING_INTERVAL_OUTGOING_PAYCHAN,
-  MIN_SETTLE_DELAY,
-  xrpToDrops,
-  dropsToXrp,
-  sleep
-} = require('./src/lib/constants')
-
-// utility functions
-const randomTag = () => bignum.fromBuffer(crypto.randomBytes(4), {
-  endian: 'big',
-  size: 4
-}).toNumber()
-
-const encodeClaim = (amount, id) => Buffer.concat([
-  Buffer.from('CLM\0'),
-  Buffer.from(id, 'hex'),
-  bignum(amount).toBuffer({
-    endian: 'big',
-    size: 8
-  })
-])
-
-const computeChannelId = (src, dest, sequence) => {
-  const preimage = Buffer.concat([
-    Buffer.from('\0x', 'ascii'),
-    Buffer.from(addressCodec.decodeAccountID(src)),
-    Buffer.from(addressCodec.decodeAccountID(dest)),
-    bignum(sequence).toBuffer({ endian: 'big', size: 4 })
-  ])
-
-  return crypto.createHash('sha512')
-    .update(preimage)
-    .digest()
-    .slice(0, 32) // first half sha512
-    .toString('hex')
-    .toUpperCase()
-}
-
-const claimFunds = async (ctx) => {
-  const self = ctx.state
-
-  const bestClaim = await self.incomingClaim.getMax()
-  const signature = bestClaim.data
-  const amount = bestClaim.value
-  const claimedValue = (await self.incomingClaimSubmitted.getMax()).value
-  if (claimedValue === amount) return
-
-  const tx = await self.api.preparePaymentChannelClaim(self.address, {
-    balance: dropsToXrp(amount),
-    channel: self.incomingPaymentChannelId,
-    signature: signature.toUpperCase(),
-    publicKey: self.incomingPaymentChannel.publicKey
-  })
-
-  const signedTx = self.api.sign(tx.txJSON, self.secret)
-  ctx.plugin.debug('submitting claim transaction ', tx)
-  const {resultCode, resultMessage} = await self.api.submit(signedTx.signedTransaction)
-  if (resultCode !== 'tesSUCCESS') {
-    ctx.plugin.debug('Error submitting claim: ', resultMessage)
-    throw new Error('Could not claim funds: ', resultMessage)
+const DEFAULT_CHANNEL_AMOUNT = 1000000
+const DEFAULT_FUND_THRESHOLD = 0.9
+
+class PluginXrpPaychan extends PluginBtp {
+  constructor (opts) {
+    super(opts)
+
+    this._xrpServer = opts.xrpServer || opts.rippledServer // TODO: deprecate rippledServer
+    this._api = new RippleAPI({ server: this._xrpServer })
+    this._secret = opts.secret
+    this._address = opts.address || deriveAddress(deriveKeypair(this._secret).publicKey)
+
+    this._peerAddress = opts.peerAddress // TODO: try to get this over the paychan?
+    this._fundThreshold = opts.fundThreshold || DEFAULT_FUND_THRESHOLD
+    this._channelAmount = opts.channelAmount || DEFAULT_CHANNEL_AMOUNT
+    this._claimInterval = opts.claimInterval || util.DEFAULT_CLAIM_INTERVAL
+    this._settleDelay = opts.settleDelay || util.MIN_SETTLE_DELAY
+
+    const keyPairSeed = util.hmac(this._secret, CHANNEL_KEYS + this._peerAddress)
+    this._keyPair = nacl.sign.keyPair.fromSeed(keyPairSeed)
+
+    this._store = new StoreWrapper(opts._store)
+    this._outgoingChannel = null
+    this._incomingChannel = null
+    this._incomingChannelDetails = null
+    this._incomingClaim = null
+    this._outgoingClaim = null
+
+    this._watcher = new ChannelWatcher(60 * 1000, this._api)
+    this._watcher.on('channelClose', () => {
+      debug('channel closing; triggering auto-disconnect')
+      // TODO: should we also close our own channel?
+      this.disconnect()
+    })
   }
 
-  return new Promise((resolve) => {
-    const handleTransaction = async function (ev) {
-      if (ev.transaction.Account !== self.address) return
-      if (ev.transaction.Channel !== self.incomingPaymentChannelId) return
-      if (ev.transaction.Balance !== amount) return
+  async _handleData (from, { requestId, data }) {
+    const { ilp, protocolMap } = this.protocolDataToIlpAndCustom(data)
 
-      if (ev.engine_result === 'tesSUCCESS') {
-        ctx.plugin.debug('successfully submitted claim', signature, 'for amount', amount)
-        await self.incomingClaimSubmitted.setIfMax({value: amount, data: signature})
-      } else {
-        ctx.plugin.debug('claiming funds failed ', ev)
-      }
+    if (protocolMap.ripple_channel_id) {
+      this._incomingChannel = protocolMap.ripple_channel_id
+      await this._reloadIncomingChannelDetails()
 
-      setImmediate(() => self.api.connection
-        .removeListener('transaction', handleTransaction))
-      resolve()
+      return [{
+        protocolName: 'ripple_channel_id',
+        contentType: BtpPacket.MIME_TEXT_PLAIN_UTF8,
+        data: Buffer.from(this._outgoingChannel)
+      }]
     }
-    self.api.connection.on('transaction', handleTransaction)
-  })
-}
-
-async function reloadIncomingChannelDetails (ctx) {
-  const self = ctx.state
-  let chanId = self.incomingPaymentChannelId
-  let incomingChan = null
-  if (!chanId) {
-    ctx.plugin.debug('quering peer for incoming channel id')
-    try {
-      chanId = await ctx.rpc.call('ripple_channel_id', self.prefix, [])
-    } catch (err) { ctx.plugin.debug(err) }
 
-    if (!chanId) {
-      ctx.plugin.debug('cannot load incoming channel. Peer did not return incoming channel id')
-      return
+    if (!this._dataHandler) {
+      throw new Error('no request handler registered')
     }
-  }
 
-  // look up channel on ledger
-  ctx.plugin.debug('retrieving details for incoming channel', chanId)
-  try {
-    incomingChan = await self.api.getPaymentChannel(chanId)
-    ctx.plugin.debug('incoming channel details are:', incomingChan)
-  } catch (err) {
-    if (err.name === 'RippledError' && err.message === 'entryNotFound') {
-      ctx.plugin.debug('incoming payment channel does not exist:', chanId)
-    } else {
-      ctx.plugin.debug(err)
-    }
-    return
-  }
-
-  const expectedBalance = (await self.incomingClaimSubmitted.getMax()).value
-  const actualBalance = new BigNumber(incomingChan.balance)
-  if (!actualBalance.equals(expectedBalance)) {
-    ctx.plugin.debug('Expected the balance of the incoming payment channel to be ' + expectedBalance +
-      ', but it was ' + actualBalance.toString())
-    throw new Error('Unexpected balance of incoming payment channel')
+    const response = await this._dataHandler(ilp)
+    return this.ilpAndCustomToProtocolData({ ilp: response })
   }
 
-  // Make sure the watcher has enough time to submit the best
-  // claim before the channel closes
-  const settleDelay = incomingChan.settleDelay
-  if (settleDelay < MIN_SETTLE_DELAY) {
-    ctx.plugin.debug(`incoming payment channel has a too low settle delay of ${settleDelay.toString()}` +
-      ` seconds. Minimum settle delay is ${MIN_SETTLE_DELAY} seconds.`)
-    throw new Error('settle delay of incoming payment channel too low')
-  }
-
-  if (incomingChan.cancelAfter) {
-    throw new Error('incoming paychan expires (.cancelAfter is set)')
-  }
-
-  if (incomingChan.expiration) {
-    throw new Error('incoming paychan expires (.expiration is set)')
-  }
+  async _reloadIncomingChannelDetails () {
+    if (!this._incomingChannel) {
+      debug('quering peer for incoming channel id')
+      try {
+        const response = await this._call(null, {
+          type: BtpPacket.TYPE_MESSAGE,
+          requestId: await util._requestId(),
+          data: { protocolData: [{
+            protocolName: 'ripple_channel_id',
+            contentType: BtpPacket.MIME_TEXT_PLAIN_UTF8,
+            data: Buffer.from(this._outgoingChannel)
+          }] }
+        })
 
-  if (incomingChan.destination !== self.address) {
-    ctx.plugin.debug('incoming channel destination is not our address: ' +
-      incomingChan.destination)
-    throw new Error('Channel destination address wrong')
-  }
+        // TODO: should this send raw bytes instead of text in the future
+        debug('got ripple_channel_id response:', response)
+        this._incomingChannel = response
+          .protocolData
+          .filter(p => p.protocolName === 'ripple_channel_id')[0]
+          .data
+          .toString()
+        this._store.set('incoming_channel', this._incomingChannel)
+      } catch (err) { debug(err) }
+
+      if (!this._incomingChannel) {
+        debug('cannot load incoming channel. Peer did not return incoming channel id')
+        return
+      }
+    }
 
-  self.incomingPaymentChannelId = chanId
-  self.incomingPaymentChannel = incomingChan
+    // look up channel on ledger
+    debug('retrieving details for incoming channel', this._incomingChannel)
+    try {
+      this._incomingChannelDetails = await this._api.getPaymentChannel(this._incomingChannel)
+      debug('incoming channel details are:', this._incomingChannelDetails)
+    } catch (err) {
+      if (err.name === 'RippledError' && err.message === 'entryNotFound') {
+        debug('incoming payment channel does not exist:', this._incomingChannel)
+      } else {
+        debug(err)
+      }
+      return
+    }
 
-  self.watcher.watch(chanId)
-}
+    // Make sure the watcher has enough time to submit the best
+    // claim before the channel closes
+    const settleDelay = this._incomingChannelDetails.settleDelay
+    if (settleDelay < util.MIN_SETTLE_DELAY) {
+      debug(`incoming payment channel has a too low settle delay of ${settleDelay.toString()}
+        seconds. Minimum settle delay is ${util.MIN_SETTLE_DELAY} seconds.`)
+      throw new Error('settle delay of incoming payment channel too low')
+    }
 
-async function fund (ctx, fundOpts) {
-  const self = ctx.state
-  ctx.plugin.debug('outgoing channel threshold reached, adding more funds')
-  const xrpAmount = dropsToXrp(self.maxAmount)
-  const tx = await self.api.preparePaymentChannelFund(self.address, Object.assign({
-    amount: xrpAmount,
-    channel: self.outgoingPaymentChannelId
-  }, fundOpts))
-
-  ctx.plugin.debug('submitting channel fund tx', tx)
-  const signedTx = self.api.sign(tx.txJSON, self.secret)
-  const {resultCode, resultMessage} = await self.api.submit(signedTx.signedTransaction)
-  if (resultCode !== 'tesSUCCESS') {
-    ctx.plugin.debug(`Failed to add ${xrpAmount} XRP to channel ${self.channelId}: `, resultMessage)
-  }
+    if (this._incomingChannelDetails.cancelAfter) {
+      debug(`channel has cancelAfter set`)
+      throw new Error('cancelAfter must not be set')
+    }
 
-  const handleTransaction = async function (ev) {
-    if (ev.transaction.hash !== signedTx.id) return
+    if (this._incomingChannelDetails.expiration) {
+      debug(`channel has expiration set`)
+      throw new Error('expiration must not be set')
+    }
 
-    if (ev.engine_result === 'tesSUCCESS') {
-      ctx.plugin.debug(`successfully funded channel for ${xrpAmount} XRP`)
-      const { amount } = await self.api.getPaymentChannel(self.outgoingPaymentChannelId)
-      self.maxAmount = xrpToDrops(amount) // TODO: no side-effects
-    } else {
-      ctx.plugin.debug('funding channel failed ', ev)
+    if (this._incomingChannelDetails.destination !== this._address) {
+      debug('incoming channel destination is not our address: ' +
+        this._incomingChannelDetails.destination)
+      throw new Error('Channel destination address wrong')
     }
 
-    setImmediate(() => self.api.connection
-      .removeListener('transaction', handleTransaction))
+    this._lastClaimedAmount = new BigNumber(util.xrpToDrops(this._incomingChannelDetails.balance))
+    this._claimIntervalId = setInterval(async () => {
+      if (this._lastClaimedAmount.isLessThan(this._incomingClaim.amount)) {
+        debug('starting automatic claim. amount=' + this._incomingClaim.amount)
+        this._lastClaimedAmount = new BigNumber(this._incomingClaim.amount)
+        await this._claimFunds()
+        debug('claimed funds.')
+      }
+    }, this._claimInterval)
   }
 
-  // TODO: handleTransaction is not called back
-  self.api.connection.on('transaction', handleTransaction)
-}
-
-function validateOpts (opts) {
-  // TODO: validate plugin options
-  // mandatory
-  assert(opts.rippledServer, 'rippledServer is required')
-  assert(opts.address, 'address is required')
-  assert(opts.secret, 'secret is required')
-  assert(opts.peerAddress, 'peerAddress is required')
-  assert(opts.maxAmount, 'maxAmount is required')
-  assert(opts.maxUnsecured, 'maxUnsecured is required')
-
-  // optional
-  if (opts.fundThreshold) {
-    assert(parseFloat(opts.fundThreshold) > 0 && parseFloat(opts.fundThreshold) <= 1)
-  }
-}
+  // run after connections are established, but before connect resolves
+  async _connect () {
+    debug('connecting to rippled')
+    await this._api.connect()
+    await this._api.connection.request({
+      command: 'subscribe',
+      accounts: [ this._address, this._peerAddress ]
+    })
+    debug('connected to rippled')
+
+    await this._store.load('outgoing_channel')
+    await this._store.load('incoming_claim')
+    await this._store.load('outgoing_claim')
+
+    this._outgoingChannel = this._store.get('outgoing_channel')
+    this._incomingClaim = JSON.parse(this._store.get('incoming_claim') || '{"amount":"0"}')
+    this._outgoingClaim = JSON.parse(this._store.get('outgoing_claim') || '{"amount":"0"}')
+    debug('loaded incoming claim:', this._incomingClaim)
+
+    if (!this._outgoingChannel) {
+      debug('creating new payment channel')
+
+      const txTag = util.randomTag()
+      const tx = await this._api.preparePaymentChannelCreate(this._address, {
+        amount: util.dropsToXrp(this._channelAmount),
+        destination: this._peerAddress,
+        settleDelay: this._settleDelay,
+        publicKey: 'ED' + Buffer.from(this._keyPair.publicKey).toString('hex').toUpperCase(),
+        sourceTag: txTag
+      })
 
-function hmac (key, message) {
-  const h = crypto.createHmac('sha256', key)
-  h.update(message)
-  return h.digest()
-}
+      debug('created paymentChannelCreate tx', tx.txJSON)
 
-module.exports = makePaymentChannelPlugin({
-  pluginName: 'xrp-paychan',
-
-  constructor: function (ctx, opts) {
-    validateOpts(opts)
-
-    const self = ctx.state
-    self.rippledServer = opts.rippledServer
-    self.api = new RippleAPI({ server: opts.rippledServer })
-    self.address = opts.address
-    self.secret = opts.secret
-    self.peerAddress = opts.peerAddress
-    self.maxAmount = opts.maxAmount
-    self.maxUnsecured = opts.maxUnsecured
-    self.fundThreshold = opts.fundThreshold || DEFAULT_REFUND_THRESHOLD
-    // self.claimThreshold = opts.claimThreshold // TODO: implement automatic claiming if threshold is reached
-    self.prefix = opts.prefix // TODO: auto-generate prefix?
-    self.authToken = opts.token
-    self.settleDelay = opts.settleDelay || MIN_SETTLE_DELAY
-
-    const keyPairSeed = hmac(self.secret, CHANNEL_KEYS + self.peerAddress)
-    self.keyPair = nacl.sign.keyPair.fromSeed(keyPairSeed)
-    self.outgoingChannel = ctx.backend.getMaxValueTracker('outgoing_channel')
-    self.incomingClaim = ctx.backend.getMaxValueTracker('incoming_claim')
-    self.incomingClaimSubmitted = ctx.backend.getMaxValueTracker('incoming_claim_submitted')
-
-    self.watcher = new ChannelWatcher(DEFAULT_WATCHER_INTERVAL, self.api)
-    self.watcher.on('channelClose', async (id, paychan) => {
-      ctx.plugin.debug('incoming channel closing; triggering disconnect')
-      self.incomingPaymentChannel = paychan
+      const signedTx = this._api.sign(tx.txJSON, this._secret)
+      let resultCode
+      let resultMessage
       try {
-        ctx.plugin.disconnect()
+        const result = await this._api.submit(signedTx.signedTransaction)
+        resultCode = result.resultCode
+        resultMessage = result.resultMessage
       } catch (err) {
-        ctx.plugin.debug('Fatal Error: failed to disconnect. ' +
-          'Operating on an incoming channel that is about to close.')
+        debug('error submitting paymentChannelCreate', err)
+        throw err
       }
-    })
-
-    ctx.rpc.addMethod('ripple_channel_id', () => {
-      if (!self.incomingPaymentChannelId) {
-        setTimeout(async () => {
-          try {
-            await reloadIncomingChannelDetails(ctx)
-          } catch (err) {
-            ctx.plugin.debug('error loading incoming channel', err)
-          }
-        }, 100)
+      if (resultCode !== 'tesSUCCESS') {
+        const message = 'Error creating the payment channel: ' + resultCode + ' ' + resultMessage
+        debug(message)
+        throw new Error(message)
       }
-      return self.outgoingPaymentChannelId || null
-    })
-  },
-
-  getAuthToken: (ctx) => (ctx.state.authToken),
 
-  connect: async function (ctx) {
-    const self = ctx.state
-    ctx.plugin.debug('connecting to rippled server:', self.rippledServer)
-    try {
-      await self.api.connect()
+      debug('submitted paymentChannelCreate, waiting for tx to be validated (this may take a few seconds)')
+      await new Promise((resolve) => {
+        const handleTransaction = (ev) => {
+          if (ev.transaction.SourceTag !== txTag) return
+          if (ev.transaction.Account !== this._address) return
+
+          this._outgoingChannel = util.computeChannelId(
+            ev.transaction.Account,
+            ev.transaction.Destination,
+            ev.transaction.Sequence)
+          this._store.set('outgoing_channel', this._outgoingChannel)
+
+          setImmediate(() => this._api.connection
+            .removeListener('transaction', handleTransaction))
+          resolve()
+        }
 
-      await self.api.connection.request({
-        command: 'subscribe',
-        accounts: [ self.address, self.peerAddress ]
+        this._api.connection.on('transaction', handleTransaction)
       })
-    } catch (err) {
-      ctx.plugin.debug('error connecting to rippled server', err)
-      throw new Error('Error connecting to rippled server: ' + err.message)
+      debug('payment channel successfully created: ', this._outgoingChannel)
     }
-    ctx.plugin.debug('connected to rippled server')
-
-    // open payment channel
-    let channelId
-    const highest = await self.outgoingChannel.getMax()
-    if (highest.value === STATE_CHANNEL) { // channel exists
-      channelId = highest.data
-      ctx.plugin.debug('using existing payment channel:', channelId)
-    } else { // create channel
-      const pluginId = uuid()
-      const tryToCreate = { value: STATE_CREATING_CHANNEL, data: pluginId }
-      const result = await self.outgoingChannel.setIfMax(tryToCreate)
-
-      // if the payment channel has not been created and this process must create it
-      if (result.value === STATE_NO_CHANNEL) {
-        ctx.plugin.debug('creating new payment channel')
-        const txTag = randomTag()
-        let tx
-        try {
-          tx = await self.api.preparePaymentChannelCreate(self.address, {
-            amount: dropsToXrp(self.maxAmount),
-            destination: self.peerAddress,
-            settleDelay: self.settleDelay,
-            publicKey: 'ED' + Buffer.from(self.keyPair.publicKey).toString('hex').toUpperCase(),
-            sourceTag: txTag
-          })
-        } catch (e) {
-          ctx.plugin.debug('Error preparing payment channel.', e)
-          throw e
-        }
 
-        ctx.plugin.debug('created paymentChannelCreate tx', tx.txJSON)
-
-        const signedTx = self.api.sign(tx.txJSON, self.secret)
-        let resultCode
-        let resultMessage
-        try {
-          const result = await self.api.submit(signedTx.signedTransaction)
-          resultCode = result.resultCode
-          resultMessage = result.resultMessage
-        } catch (err) {
-          ctx.plugin.debug('error submitting paymentChannelCreate', err)
-          throw err
-        }
-        if (resultCode !== 'tesSUCCESS') {
-          const message = 'Error creating the payment channel: ' + resultCode + ' ' + resultMessage
-          ctx.plugin.debug(message)
-          throw new Error(message)
-        }
-
-        ctx.plugin.debug('submitted paymentChannelCreate, waiting for tx to be validated (this may take a few seconds)')
-        await new Promise((resolve) => {
-          function handleTransaction (ev) {
-            if (ev.transaction.SourceTag !== txTag) return
-            if (ev.transaction.Account !== self.address) return
+    this._outgoingChannelDetails = await this._api.getPaymentChannel(this._outgoingChannel)
+    await this._reloadIncomingChannelDetails()
+  }
 
-            channelId = computeChannelId(
-              ev.transaction.Account,
-              ev.transaction.Destination,
-              ev.transaction.Sequence)
+  async _claimFunds () {
+    if (!this._incomingClaim.signature) {
+      return
+    }
 
-            setImmediate(() => self.api.connection
-              .removeListener('transaction', handleTransaction))
-            resolve()
-          }
+    const tx = await this._api.preparePaymentChannelClaim(this._address, {
+      balance: util.dropsToXrp(this._incomingClaim.amount),
+      channel: this._incomingChannel,
+      signature: this._incomingClaim.signature.toUpperCase(),
+      publicKey: this._incomingChannelDetails.publicKey
+    })
 
-          self.api.connection.on('transaction', handleTransaction)
-        })
-        ctx.plugin.debug('payment channel successfully created: ', channelId)
-
-        await self.outgoingChannel.setIfMax({ value: STATE_CHANNEL, data: channelId })
-      } else if (result.value === STATE_CREATING_CHANNEL) {
-      // if another process is currently creating the channel poll for channelId
-        ctx.plugin.debug(`polling for channelId (plugin id ${pluginId})`)
-        while ((await self.outgoingChannel.getMax()).value !== STATE_CHANNEL) {
-          await sleep(POLLING_INTERVAL_OUTGOING_PAYCHAN)
-        }
-        channelId = (await self.outgoingChannel.getMax()).data
-      }
+    const signedTx = this._api.sign(tx.txJSON, this._secret)
+    debug('submitting claim transaction ', tx)
+    const {resultCode, resultMessage} = await this._api.submit(signedTx.signedTransaction)
+    if (resultCode !== 'tesSUCCESS') {
+      debug('Error submitting claim: ', resultMessage)
+      throw new Error('Could not claim funds: ', resultMessage)
     }
 
-    self.outgoingPaymentChannelId = channelId
-    self.outgoingPaymentChannel = await self.api.getPaymentChannel(channelId)
+    return new Promise((resolve) => {
+      const handleTransaction = (ev) => {
+        if (ev.transaction.Account !== this._address) return
+        if (ev.transaction.Channel !== this._incomingChannel) return
 
-    await reloadIncomingChannelDetails(ctx)
-  },
+        if (ev.engine_result === 'tesSUCCESS') {
+          debug('successfully submitted claim', this._incomingClaim)
+        } else {
+          debug('claiming funds failed ', ev)
+        }
 
-  disconnect: async function (ctx) {
-    const self = ctx.state
-    ctx.plugin.debug('disconnecting payment channel')
+        setImmediate(() => this._api.connection
+          .removeListener('transaction', handleTransaction))
+        resolve()
+      }
+      this._api.connection.on('transaction', handleTransaction)
+    })
+  }
+
+  async _disconnect () {
+    debug('disconnecting payment channel')
+    clearInterval(this._claimIntervalId)
     try {
-      await claimFunds(ctx)
-    } catch (err) {
-      ctx.plugin.debug(err)
+      await this._claimFunds()
+    } catch (e) {
+      debug('claim error on disconnect:', e)
     }
 
     try {
-      self.api.disconnect()
-    } catch (err) {
-      ctx.plugin.debug('Error disconnecting from rippled', err)
-    }
-  },
-
-  getAccount: ctx => ctx.plugin._prefix + ctx.state.address,
-  getPeerAccount: ctx => ctx.plugin._prefix + ctx.state.peerAddress,
-  getInfo: ctx => ({
-    currencyCode: 'XRP',
-    currencyScale: 6,
-    prefix: ctx.plugin._prefix,
-    connectors: [ ctx.plugin._prefix + ctx.state.peerAddress ]
-  }),
-
-  handleIncomingPrepare: async function (ctx, transfer) {
-    const self = ctx.state
-
-    if (!self.incomingPaymentChannel) {
-      throw new Error('incoming payment channel must be established ' +
-        'before incoming transfers are processed')
+      this._api.disconnect()
+    } catch (e) {
+      debug('error disconnecting from rippled:', e)
     }
+  }
 
-    if (self.incomingPaymentChannel.expiration) {
-      throw new Error('cannot process transfer for a payment channel that is closing')
+  async sendMoney (amount) {
+    const claimAmount = new BigNumber(this._outgoingClaim.amount).plus(amount)
+    const encodedClaim = util.encodeClaim(claimAmount, this._outgoingChannel)
+    const signature = nacl.sign.detached(encodedClaim, this._keyPair.secretKey)
+
+    debug(`signed outgoing claim for ${claimAmount.toString()} drops on
+      channel ${this._outgoingChannel}`)
+
+    if (!this._funding && claimAmount.isGreaterThan(new BigNumber(util.xrpToDrops(this._outgoingChannelDetails.amount)).times(this._fundThreshold))) {
+      this._funding = true
+      util.fundChannel({
+        api: this._api,
+        channel: this._outgoingChannel,
+        amount: this._channelAmount,
+        address: this._address,
+        secret: this._secret
+      })
+        .then(() => {
+          this._funding = false
+        })
+        .catch((e) => {
+          this._funding = false
+          debug('error issuing fund tx:', e)
+        })
     }
 
-    // TODO:
-    // 1) check that the transfer does not exceed the incoming chan amount
-
-    // check that the unsecured amount does not exceed the limit
-    const incoming = await ctx.transferLog.getIncomingFulfilledAndPrepared()
-    const amountSecured = await self.incomingClaim.getMax()
-    const exceeds = new BigNumber(incoming)
-      .minus(amountSecured.value)
-      .greaterThan(self.maxUnsecured)
-
-    if (exceeds) {
-      throw new Error(transfer.id + ' exceeds max unsecured balance of: ', self.maxUnsecured)
+    this._outgoingClaim = {
+      amount: claimAmount.toString(),
+      signature: Buffer.from(signature).toString('hex')
     }
-  },
-
-  createOutgoingClaim: async function (ctx, outgoingBalance) {
-    // generate claim for amount
-    const self = ctx.state
-    const encodedClaim = encodeClaim(outgoingBalance, self.outgoingPaymentChannelId)
-
-    // sign a claim
-    const signature = nacl.sign.detached(encodedClaim, self.keyPair.secretKey)
-
-    ctx.plugin.debug(`signing outgoing claim for ${outgoingBalance} drops on ` +
-      `channel ${self.outgoingPaymentChannelId}`)
+    this._store.set('outgoing_claim', JSON.stringify(this._outgoingClaim))
+
+    await this._call(null, {
+      type: BtpPacket.TYPE_TRANSFER,
+      requestId: await util._requestId(),
+      data: {
+        amount,
+        protocolData: [{
+          protocolName: 'claim',
+          contentType: BtpPacket.MIME_APPLICATION_JSON,
+          data: Buffer.from(JSON.stringify(this._outgoingClaim))
+        }]
+      }
+    })
+  }
 
-    // TODO: issue a fund tx if self.fundPercent is reached and tell peer about fund tx
-    if (outgoingBalance > self.maxAmount * self.fundThreshold) {
-      await fund(ctx)
+  async _handleMoney (from, { requestId, data }) {
+    const amount = data.amount
+    const protocolData = data.protocolData
+    const claim = JSON.parse(protocolData
+      .filter(p => p.protocolName === 'claim')[0]
+      .data
+      .toString())
+
+    const claimAmount = new BigNumber(claim.amount)
+    const encodedClaim = util.encodeClaim(claim.amount, this._incomingChannel)
+    const addedMoney = claimAmount.minus(this._incomingClaim.amount)
+
+    if (addedMoney.lte(0)) {
+      throw new Error('new claim is less than old claim. new=' + claim.amount +
+        ' old=' + this._incomingClaim.amount)
     }
 
-    // return claim+amount
-    return {
-      amount: outgoingBalance,
-      signature: Buffer.from(signature).toString('hex')
+    // Don't throw an error here; we'll just emit the addedMoney amount and keep going.
+    // This can happen during high throughput when transfers may get out of sync with
+    // settlements. So long as one peer doesn't crash before balances are written, the
+    // discrepency should go away automatically.
+    if (!addedMoney.isEqualTo(amount)) {
+      debug('warning: peer balance is out of sync with ours. peer thinks they sent ' +
+        amount + '; we got ' + addedMoney.toString())
     }
-  },
 
-  handleIncomingClaim: async function (ctx, claim) {
-    // get claim+amount
-    const self = ctx.state
-    if (!self.incomingPaymentChannel) await reloadIncomingChannelDetails(ctx)
-    const { amount, signature } = claim
-    ctx.plugin.debug(`received claim for ${amount} drops on channel ${self.incomingPaymentChannelId}`)
+    debug(`received claim for ${addedMoney.toString()} drops on channel ${this._incomingChannel}`)
 
-    const encodedClaim = encodeClaim(amount, self.incomingPaymentChannelId)
     let valid = false
     try {
       valid = nacl.sign.detached.verify(
         encodedClaim,
-        Buffer.from(signature, 'hex'),
-        Buffer.from(self.incomingPaymentChannel.publicKey.substring(2), 'hex')
+        Buffer.from(claim.signature, 'hex'),
+        Buffer.from(this._incomingChannelDetails.publicKey.substring(2), 'hex')
       )
     } catch (err) {
-      ctx.plugin.debug('verifying signature failed:', err.message)
+      debug('verifying signature failed:', err.message)
     }
+
     // TODO: better reconciliation if claims are invalid
     if (!valid) {
-      ctx.plugin.debug(`got invalid claim signature ${signature} for amount ${amount} drops`)
+      debug(`got invalid claim signature ${claim.signature} for amount
+        ${claimAmount.toString()} drops total`)
       throw new Error('got invalid claim signature ' +
-        signature + ' for amount ' + amount + ' drops')
+        claim.signature + ' for amount ' + claimAmount.toString() +
+        ' drops total')
     }
 
     // validate claim against balance
-    const channelBalance = xrpToDrops(self.incomingPaymentChannel.amount)
-    if (new BigNumber(amount).gt(channelBalance)) {
-      const message = 'got claim for amount higher than channel balance. amount: ' + amount + ', incoming channel balance: ' + channelBalance
-      ctx.plugin.debug(message)
+    const channelAmount = util.xrpToDrops(this._incomingChannelDetails.amount)
+    if (claimAmount.isGreaterThan(channelAmount)) {
+      const message = 'got claim for amount higher than channel balance. amount: ' +
+        claimAmount.toString() +
+        ' incoming channel amount: ' +
+        channelAmount
+
+      debug(message)
       throw new Error(message)
     }
 
-    // TODO: issue claim tx if self.claimPercent is exceeded
-    // store in max value tracker, throw error if invalid
-    await self.incomingClaim.setIfMax({
-      value: amount,
-      data: signature
-    })
+    this._incomingClaim = {
+      amount: claimAmount.toString(),
+      signature: claim.signature.toUpperCase()
+    }
+    this._store.set('incoming_claim', JSON.stringify(this._incomingClaim))
+
+    if (this._moneyHandler) {
+      await this._moneyHandler(addedMoney.toString())
+    }
+
+    return []
   }
-})
+}
+
+PluginXrpPaychan.version = 2
+module.exports = PluginXrpPaychan
diff --git a/package-lock.json b/package-lock.json
index 7da11e0..110427e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,16 +4,6 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
-    "@types/node": {
-      "version": "6.0.92",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-6.0.92.tgz",
-      "integrity": "sha512-awEYSSTn7dauwVCYSx2CJaPTu0Z1Ht2oR1b2AD3CYao6ZRb+opb6EL43fzmD7eMFgMHzTBWSUzlWSD+S8xN0Nw=="
-    },
-    "abbrev": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.0.tgz",
-      "integrity": "sha1-0FVMIlZjbi9W58LlrRg/hZQo2B8="
-    },
     "acorn": {
       "version": "5.1.2",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.1.2.tgz",
@@ -50,6 +40,7 @@
       "version": "4.11.8",
       "resolved": "https://registry.npmjs.org/ajv/-/ajv-4.11.8.tgz",
       "integrity": "sha1-gv+wKynmYq5TvcIK8VlHcGc5xTY=",
+      "dev": true,
       "requires": {
         "co": "4.6.0",
         "json-stable-stringify": "1.0.1"
@@ -61,23 +52,6 @@
       "integrity": "sha1-MU3QpLM2j609/NxU7eYXG4htrzw=",
       "dev": true
     },
-    "align-text": {
-      "version": "0.1.4",
-      "resolved": "https://registry.npmjs.org/align-text/-/align-text-0.1.4.tgz",
-      "integrity": "sha1-DNkKVhCT810KmSVsIrcGlDP60Rc=",
-      "dev": true,
-      "requires": {
-        "kind-of": "3.2.2",
-        "longest": "1.0.1",
-        "repeat-string": "1.6.1"
-      }
-    },
-    "amdefine": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
-      "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=",
-      "dev": true
-    },
     "ansi-escapes": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-3.0.0.tgz",
@@ -87,7 +61,8 @@
     "ansi-regex": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
-      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8="
+      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+      "dev": true
     },
     "ansi-styles": {
       "version": "2.2.1",
@@ -95,20 +70,6 @@
       "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
       "dev": true
     },
-    "aproba": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/aproba/-/aproba-1.1.2.tgz",
-      "integrity": "sha512-ZpYajIfO0j2cOFTO955KUMIKNmj6zhX8kVztMAxFsDaMwz+9Z9SV0uou2pC9HJqcfpffOsjnbrDMvkNy+9RXPw=="
-    },
-    "are-we-there-yet": {
-      "version": "1.1.4",
-      "resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-1.1.4.tgz",
-      "integrity": "sha1-u13KOCu5TwXhUZQ3PRb9O6HKEQ0=",
-      "requires": {
-        "delegates": "1.0.0",
-        "readable-stream": "2.3.3"
-      }
-    },
     "argparse": {
       "version": "1.0.9",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.9.tgz",
@@ -139,48 +100,17 @@
       "integrity": "sha1-iYUI2iIm84DfkEcoRWhJwVAaSw0=",
       "dev": true
     },
-    "asn1": {
-      "version": "0.2.3",
-      "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.3.tgz",
-      "integrity": "sha1-2sh4dxPJlmhJ/IGAd36+nB3fO4Y="
-    },
-    "assert-plus": {
-      "version": "0.2.0",
-      "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-0.2.0.tgz",
-      "integrity": "sha1-104bh+ev/A24qttwIfP+SBAasjQ="
-    },
     "assertion-error": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-1.0.2.tgz",
       "integrity": "sha1-E8pRXYYgbaC6xm6DTdOX2HWBCUw=",
       "dev": true
     },
-    "async": {
-      "version": "1.5.2",
-      "resolved": "https://registry.npmjs.org/async/-/async-1.5.2.tgz",
-      "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=",
-      "dev": true
-    },
     "async-limiter": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/async-limiter/-/async-limiter-1.0.0.tgz",
       "integrity": "sha512-jp/uFnooOiO+L211eZOoSyzpOITMXx1rBITauYykG3BRYPu8h0UcxsPNB04RR5vo4Tyz3+ay17tR6JVf9qzYWg=="
     },
-    "asynckit": {
-      "version": "0.4.0",
-      "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
-      "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k="
-    },
-    "aws-sign2": {
-      "version": "0.6.0",
-      "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.6.0.tgz",
-      "integrity": "sha1-FDQt0428yU0OW4fXY81jYSwOeU8="
-    },
-    "aws4": {
-      "version": "1.6.0",
-      "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.6.0.tgz",
-      "integrity": "sha1-g+9cqGCysy5KDe7e6MdxudtXRx4="
-    },
     "babel-code-frame": {
       "version": "6.26.0",
       "resolved": "https://registry.npmjs.org/babel-code-frame/-/babel-code-frame-6.26.0.tgz",
@@ -236,7 +166,8 @@
     "balanced-match": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
-      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c="
+      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
+      "dev": true
     },
     "base-x": {
       "version": "1.1.0",
@@ -248,70 +179,21 @@
       "resolved": "https://registry.npmjs.org/base64url/-/base64url-2.0.0.tgz",
       "integrity": "sha1-6sFuA+oUOO/5Qj1puqNiYu0fcLs="
     },
-    "base64url-adhoc": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/base64url-adhoc/-/base64url-adhoc-2.0.1.tgz",
-      "integrity": "sha1-j5bFIlgHi6yEWziVCF20vUuth+I=",
-      "requires": {
-        "@types/node": "6.0.92"
-      }
-    },
-    "bcrypt-pbkdf": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.1.tgz",
-      "integrity": "sha1-Y7xdy2EzG5K8Bf1SiVPDNGKgb40=",
-      "optional": true,
-      "requires": {
-        "tweetnacl": "0.14.5"
-      },
-      "dependencies": {
-        "tweetnacl": {
-          "version": "0.14.5",
-          "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz",
-          "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=",
-          "optional": true
-        }
-      }
-    },
-    "bignum": {
-      "version": "0.12.5",
-      "resolved": "https://registry.npmjs.org/bignum/-/bignum-0.12.5.tgz",
-      "integrity": "sha1-II8rDhjrj9aVCRfjcY5M2FzM/80=",
-      "requires": {
-        "nan": "2.7.0",
-        "node-pre-gyp": "0.6.37"
-      }
-    },
     "bignumber.js": {
-      "version": "2.4.0",
-      "resolved": "https://registry.npmjs.org/bignumber.js/-/bignumber.js-2.4.0.tgz",
-      "integrity": "sha1-g4qZLan51zfg9LLbC+YrsJ3Qxeg="
-    },
-    "block-stream": {
-      "version": "0.0.9",
-      "resolved": "https://registry.npmjs.org/block-stream/-/block-stream-0.0.9.tgz",
-      "integrity": "sha1-E+v+d4oDIFz+A3UUgeu0szAMEmo=",
-      "requires": {
-        "inherits": "2.0.3"
-      }
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/bignumber.js/-/bignumber.js-6.0.0.tgz",
+      "integrity": "sha512-x247jIuy60/+FtMRvscqfxtVHQf8AGx2hm9c6btkgC0x/hp9yt+teISNhvF8WlwRkCc5yF2fDECH8SIMe8j+GA=="
     },
     "bn.js": {
       "version": "4.11.8",
       "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.8.tgz",
       "integrity": "sha512-ItfYfPLkWHUjckQCk8xC+LwxgK8NYcXywGigJgSwOP8Y2iyWT4f2vsZnoOXTTbo+o5yXmIUJ4gn5538SO5S3gA=="
     },
-    "boom": {
-      "version": "2.10.1",
-      "resolved": "https://registry.npmjs.org/boom/-/boom-2.10.1.tgz",
-      "integrity": "sha1-OciRjO/1eZ+D+UkqhI9iWt0Mdm8=",
-      "requires": {
-        "hoek": "2.16.3"
-      }
-    },
     "brace-expansion": {
       "version": "1.1.8",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.8.tgz",
       "integrity": "sha1-wHshHHyVLsH479Uad+8NHTmQopI=",
+      "dev": true,
       "requires": {
         "balanced-match": "1.0.0",
         "concat-map": "0.0.1"
@@ -329,21 +211,21 @@
       "dev": true
     },
     "btp-packet": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/btp-packet/-/btp-packet-1.0.0.tgz",
-      "integrity": "sha1-W4k+pEaYuMky4ZzoeIzamg0o/6I=",
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/btp-packet/-/btp-packet-1.2.0.tgz",
+      "integrity": "sha1-52w4bNLC/EL6I7azQjCys3/Zghk=",
       "requires": {
         "base64url": "2.0.0",
-        "bignumber.js": "4.0.4",
+        "bignumber.js": "4.1.0",
         "dateformat": "2.2.0",
-        "oer-utils": "1.3.3",
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-    "uglify-js": {
-      "version": "2.8.29",
-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-2.8.29.tgz",
-      "integrity": "sha1-KcVzMUgFe7Th913zW3qcty5qWd0=",
-      "dev": true,
-      "optional": true,
-      "requires": {
-        "source-map": "0.5.7",
-        "uglify-to-browserify": "1.0.2",
-        "yargs": "3.10.0"
-      },
-      "dependencies": {
-        "source-map": {
-          "version": "0.5.7",
-          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
-          "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
-          "dev": true,
-          "optional": true
-        }
-      }
-    },
-    "uglify-to-browserify": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/uglify-to-browserify/-/uglify-to-browserify-1.0.2.tgz",
-      "integrity": "sha1-bgkk1r2mta/jSeOabWMoUKD4grc=",
-      "dev": true,
-      "optional": true
-    },
-    "uid-number": {
-      "version": "0.0.6",
-      "resolved": "https://registry.npmjs.org/uid-number/-/uid-number-0.0.6.tgz",
-      "integrity": "sha1-DqEOgDXo61uOREnwbaHHMGY7qoE="
-    },
     "ultron": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/ultron/-/ultron-1.0.2.tgz",
@@ -3720,23 +4300,14 @@
     "util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
-      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
-    },
-    "uuid": {
-      "version": "3.1.0",
-      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.1.0.tgz",
-      "integrity": "sha512-DIWtzUkw04M4k3bf1IcpS2tngXEL26YUD2M0tMDUpnUrz2hgzUBlD55a4FjdLGPvfHxS6uluGWvaVEqgBcVa+g=="
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
+      "dev": true
     },
     "uuid-parse": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/uuid-parse/-/uuid-parse-1.0.0.tgz",
       "integrity": "sha1-9GV3F2JLDkuIrzb5jYlYmlu+5Wk="
     },
-    "uuid4": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/uuid4/-/uuid4-1.0.0.tgz",
-      "integrity": "sha1-gTqurxHqL2iQnFrVfYlPgyAtZyA="
-    },
     "validate-npm-package-license": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.1.tgz",
@@ -3747,23 +4318,6 @@
         "spdx-expression-parse": "1.0.4"
       }
     },
-    "verror": {
-      "version": "1.10.0",
-      "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
-      "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
-      "requires": {
-        "assert-plus": "1.0.0",
-        "core-util-is": "1.0.2",
-        "extsprintf": "1.3.0"
-      },
-      "dependencies": {
-        "assert-plus": {
-          "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
-          "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU="
-        }
-      }
-    },
     "walker": {
       "version": "1.0.7",
       "resolved": "https://registry.npmjs.org/walker/-/walker-1.0.7.tgz",
@@ -3782,21 +4336,6 @@
         "isexe": "2.0.0"
       }
     },
-    "wide-align": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.2.tgz",
-      "integrity": "sha512-ijDLlyQ7s6x1JgCLur53osjm/UXUYD9+0PbYKrBsYisYXzCxN+HC3mYDNy/dWdmf3AwqwU3CXwDCvsNgGK1S0w==",
-      "requires": {
-        "string-width": "1.0.2"
-      }
-    },
-    "window-size": {
-      "version": "0.1.0",
-      "resolved": "https://registry.npmjs.org/window-size/-/window-size-0.1.0.tgz",
-      "integrity": "sha1-VDjNLqk7IC76Ohn+iIeu58lPnJ0=",
-      "dev": true,
-      "optional": true
-    },
     "winston": {
       "version": "2.4.0",
       "resolved": "https://registry.npmjs.org/winston/-/winston-2.4.0.tgz",
@@ -3828,7 +4367,8 @@
     "wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
-      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
     },
     "wrench": {
       "version": "1.3.9",
@@ -3867,19 +4407,6 @@
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
       "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
       "dev": true
-    },
-    "yargs": {
-      "version": "3.10.0",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.10.0.tgz",
-      "integrity": "sha1-9+572FfdfB0tOMDnTvvWgdFDH9E=",
-      "dev": true,
-      "optional": true,
-      "requires": {
-        "camelcase": "1.2.1",
-        "cliui": "2.1.0",
-        "decamelize": "1.2.0",
-        "window-size": "0.1.0"
-      }
     }
   }
 }
diff --git a/package.json b/package.json
index d078711..808a4a3 100644
--- a/package.json
+++ b/package.json
@@ -4,8 +4,8 @@
   "description": "",
   "main": "index.js",
   "scripts": {
-    "test": "istanbul test -- _mocha",
-    "integration": "istanbul test -- _mocha test/integration",
+    "test": "nyc --reporter=lcov mocha --",
+    "integration": "nyc --reporter=lcov mocha test/integration --",
     "lint": "eslint ."
   },
   "author": "",
@@ -21,21 +21,21 @@
     "eslint-plugin-node": "^5.1.0",
     "eslint-plugin-promise": "^3.5.0",
     "eslint-plugin-standard": "^3.0.1",
-    "istanbul": "^0.4.5",
+    "ilp-packet": "^2.2.0",
     "mocha": "^3.5.3",
     "nock": "^9.0.20",
+    "nyc": "^11.4.1",
     "proxyquire": "^1.8.0",
     "sinon": "^3.3.0",
     "sinon-chai": "^2.13.0"
   },
   "dependencies": {
-    "bignum": "^0.12.5",
-    "btp-packet": "^1.0.0",
-    "ilp-plugin-payment-channel-framework": "^1.3.1",
-    "ilp-plugin-xrp-paychan-shared": "git+https://git@github.com/dappelt/ilp-plugin-xrp-paychan-shared.git",
-    "moment": "^2.19.2",
+    "bignumber.js": "^6.0.0",
+    "btp-packet": "^1.2.0",
+    "ilp-plugin-btp": "^1.1.8",
+    "ilp-plugin-xrp-paychan-shared": "^2.0.0",
+    "ilp-store-memory": "^1.0.0",
     "ripple-lib": "^0.17.7",
-    "tweetnacl": "^1.0.0",
-    "uuid": "^3.1.0"
+    "tweetnacl": "^1.0.0"
   }
 }
diff --git a/store-wrapper.js b/store-wrapper.js
new file mode 100644
index 0000000..a27d18a
--- /dev/null
+++ b/store-wrapper.js
@@ -0,0 +1,32 @@
+class StoreWrapper {
+  constructor (store) {
+    this._store = store
+    this._cache = new Map()
+    this._write = Promise.resolve()
+  }
+
+  async load (key) {
+    if (!this._store) return
+    if (this._cache.get(key)) return
+    const value = await this._store.get(key)
+
+    if (!this._cache.get(key)) this._cache.set(key, value)
+  }
+
+  get (key) {
+    return this._cache.get(key)
+  }
+
+  set (key, value) {
+    this._cache.set(key, value)
+    this._write = this._write.then(() => {
+      return this._store.put(key, value)
+    })
+  }
+
+  setCache (key, value) {
+    this._cache.set(key, value)
+  }
+}
+
+module.exports = StoreWrapper
diff --git a/test/channelSpec.js b/test/channelSpec.js
deleted file mode 100644
index 2eea9db..0000000
--- a/test/channelSpec.js
+++ /dev/null
@@ -1,456 +0,0 @@
-'use strict'
-
-const chai = require('chai')
-const chaiAsPromised = require('chai-as-promised')
-chai.use(chaiAsPromised)
-const sinon = require('sinon')
-const sinonChai = require('sinon-chai')
-chai.use(sinonChai)
-
-const assert = chai.assert
-const expect = chai.expect
-
-const MockSocket = require('ilp-plugin-payment-channel-framework/test/helpers/mockSocket')
-const Store = require('ilp-plugin-payment-channel-framework/test/helpers/objStore')
-
-const realSetTimeout = setTimeout
-const sleep = (time) => new Promise((resolve) => realSetTimeout(resolve, time))
-
-const apiHelper = require('./helper/apiHelper')
-const btpPacket = require('btp-packet')
-const proxyquire = require('proxyquire')
-const {
-  DEFAULT_WATCHER_INTERVAL,
-  STATE_CREATING_CHANNEL,
-  STATE_CHANNEL,
-  POLLING_INTERVAL_OUTGOING_PAYCHAN,
-  dropsToXrp
-} = require('../src/lib/constants')
-
-async function _connectPlugin () {
-  this.mockSocket.reply(btpPacket.TYPE_MESSAGE, ({requestId}) => {
-    return btpPacket.serializeResponse(requestId, this.payChanIdResponse)
-  })
-  await this.plugin.connect()
-}
-
-describe('channelSpec', function () {
-  beforeEach(function () {
-    // Plugin Options
-    this.opts = {
-      maxBalance: '1000000000',
-      server: 'btp+wss://btp-server.example',
-      prefix: 'g.eur.mytrustline.',
-      info: {
-        prefix: 'g.eur.mytrustline.',
-        currencyScale: 9,
-        currencyCode: 'XRP',
-        connector: []
-      },
-      settleDelay: 60 * 60, // 1 hour
-      token: 'shared_secret',
-      rippledServer: 'wss://s.altnet.rippletest.net:51233',
-      address: 'rQBHyjckUFGZK1nPDKzTU8Zyvd2niqHcpo',
-      secret: 'shDssKGbxxpJacxpQzfacKcnutYGU',
-      peerAddress: 'rPZUg1NH7gAfkpRpKbcwyn8ET7EPqhTFiv',
-      channelSecret: 'shh its a secret',
-      maxUnsecured: '5000',
-      maxAmount: '100000',
-      rpcUri: 'btp+wss://peer.example',
-      _store: new Store()
-    }
-    this.claim = {
-      amount: 5,
-      signature: '87e36f2f3c470f0b9f3dcb81c0ddacc77000a208e861b519716179805a55d5784dfae2a6ec4d68a75c3f190ee7352bcbc9b7191a43d435da598da4d98b544c03'
-    }
-    this.exceedingClaim = {
-      amount: 5000000,
-      signature: '428b5744c282895d631da6af8d7472d308227fa885c2b5c2bb587d2a021efaa50b1bae30e60ff3197c894f8f8325835bea9e38631e270ea6d75c8240f2927d04'
-    }
-
-    const ApiStub = apiHelper.makeApi(this.opts)
-    const PluginRipple = proxyquire('../index', {
-      'ripple-lib': {
-        'RippleAPI': ApiStub
-      }
-    })
-
-    this.clock = sinon.useFakeTimers({toFake: ['setTimeout', 'setInterval'], shouldAdvanceTime: true})
-    this.plugin = new PluginRipple(this.opts)
-    this.pluginContext = this.plugin._paychanContext
-    this.pluginState = this.plugin._paychanContext.state
-    this.mockSocket = new MockSocket()
-    this.mockSocket.reply(btpPacket.TYPE_MESSAGE, ({requestId}) => {
-      return btpPacket.serializeResponse(requestId, []) // reply to auth message
-    })
-    this.plugin.addSocket(this.mockSocket, {username: '', token: ''})
-    this.incomingPaymentChannelId = '1234567890ABCDEF'
-
-    this.payChanIdRequest = [{
-      protocolName: 'ripple_channel_id',
-      contentType: btpPacket.MIME_APPLICATION_JSON,
-      data: Buffer.from('[]')
-    }]
-    this.payChanIdResponse = [{
-      protocolName: 'ripple_channel_id',
-      contentType: btpPacket.MIME_APPLICATION_JSON,
-      data: Buffer.from(`"${this.incomingPaymentChannelId}"`)
-    }]
-    this.payChanIdResponseNull = [{
-      protocolName: 'ripple_channel_id',
-      contentType: btpPacket.MIME_APPLICATION_JSON,
-      data: Buffer.from(JSON.stringify(null))
-    }]
-  })
-
-  afterEach(async function () {
-    this.clock.restore()
-    assert(await this.mockSocket.isDone(), 'request handlers must have been called')
-  })
-
-  describe('connect', function () {
-    it('creates a payment channel', async function () {
-      this.mockSocket.reply(btpPacket.TYPE_MESSAGE, ({requestId}) => {
-        return btpPacket.serializeResponse(requestId, this.payChanIdResponse)
-      })
-
-      const connectSpy = sinon.spy(this.pluginState.api, 'connect')
-      const prepareSpy = sinon.spy(this.pluginState.api, 'preparePaymentChannelCreate')
-      const signSpy = sinon.spy(this.pluginState.api, 'sign')
-      const submitSpy = sinon.spy(this.pluginState.api, 'submit')
-
-      await this.plugin.connect()
-
-      expect(prepareSpy).to.have.been.calledAfter(connectSpy).and
-        .calledWith(this.opts.address)
-      expect(signSpy).to.have.been.calledAfter(prepareSpy).and
-        .calledWith('"some JSON string"')
-      expect(submitSpy).to.have.been.calledAfter(signSpy).and
-        .calledWith('1234567890ABCDEF')
-
-      const [ , payChanCreate ] = prepareSpy.firstCall.args
-      delete payChanCreate.sourceTag
-      const expectedPubKey = 'ED' + Buffer.from(this.pluginState.keyPair.publicKey)
-        .toString('hex').toUpperCase()
-      assert.deepEqual(payChanCreate, {
-        amount: dropsToXrp(this.opts.maxAmount),
-        destination: this.opts.peerAddress,
-        settleDelay: this.opts.settleDelay,
-        publicKey: expectedPubKey
-      })
-    })
-
-    it('uses existing payment channel', async function () {
-      this.mockSocket.reply(btpPacket.TYPE_MESSAGE, ({requestId}) => {
-        return btpPacket.serializeResponse(requestId, this.payChanIdResponse)
-      })
-
-      const outgoingChannel = this.plugin._paychanContext.backend
-        .getMaxValueTracker('outgoing_channel')
-      await outgoingChannel.setIfMax({
-        value: STATE_CHANNEL,
-        data: '1234567890ABCDEF'
-      })
-
-      const submitSpy = sinon.spy(this.pluginState.api, 'submit')
-      await this.plugin.connect()
-      expect(submitSpy).to.have.not.been.called
-      expect(this.pluginState.outgoingPaymentChannelId)
-        .to.be.equal('1234567890ABCDEF')
-    })
-
-    it('waits for another instance to create a channel', async function () {
-      this.mockSocket.reply(btpPacket.TYPE_MESSAGE, ({requestId}) => {
-        return btpPacket.serializeResponse(requestId, this.payChanIdResponse)
-      })
-
-      const outgoingChannel = this.pluginState.outgoingChannel
-      await outgoingChannel.setIfMax({
-        value: STATE_CREATING_CHANNEL,
-        data: 'ade66de4-9cbf-4f0d-8084-42e10247a4fb'
-      })
-
-      const submitSpy = sinon.spy(this.pluginState.api, 'submit')
-      this.plugin.connect()
-
-      await sleep(10) // wait for the plugin to start polling
-      await outgoingChannel.setIfMax({
-        value: STATE_CHANNEL,
-        data: '1234567890ABCDEF'
-      })
-      this.clock.tick(POLLING_INTERVAL_OUTGOING_PAYCHAN + 1000)
-      await sleep(10) // wait for the plugin to retrieve the channelId
-
-      expect(submitSpy).to.have.not.been.called
-      expect(this.pluginState.outgoingPaymentChannelId)
-        .to.be.equal('1234567890ABCDEF')
-    })
-
-    it('requests incoming payment channel id on connect()', async function () {
-      this.mockSocket.reply(btpPacket.TYPE_MESSAGE, ({requestId, data}) => {
-        assert.nestedProperty(data, 'protocolData')
-        assert.deepEqual(data.protocolData, this.payChanIdRequest)
-        return btpPacket.serializeResponse(requestId, this.payChanIdResponse)
-      })
-      await this.plugin.connect()
-
-      assert.equal(this.pluginState.incomingPaymentChannelId,
-        this.incomingPaymentChannelId)
-    })
-
-    it('requests incoming payment channel id on ripple_channel_id request', async function () {
-      // The first ripple_channel_id request is anwsered with null.
-      // Only on the second ripple_channel_id request the mockSocket returns
-      // the channel id.
-      this.mockSocket.reply(btpPacket.TYPE_MESSAGE, ({requestId, data}) => {
-        assert.nestedProperty(data, 'protocolData')
-        assert.deepEqual(data.protocolData, this.payChanIdRequest)
-        return btpPacket.serializeResponse(requestId, this.payChanIdResponseNull)
-      }).reply(btpPacket.TYPE_RESPONSE)
-        .reply(btpPacket.TYPE_MESSAGE, ({requestId, data}) => {
-          assert.nestedProperty(data, 'protocolData')
-          assert.deepEqual(data.protocolData, this.payChanIdRequest)
-          return btpPacket.serializeResponse(requestId, this.payChanIdResponse)
-        })
-      await this.plugin.connect()
-
-      // the plugin should not yet have an incoming pay chan id after connect()
-      assert.equal(this.pluginState.incomingPaymentChannelId, null)
-
-      // a ripple_channel_id request should trigger the plugin to try again
-      // to get the incoming payment channel id
-      const btpMessage = btpPacket.serializeMessage(1234, this.payChanIdRequest)
-
-      this.mockSocket.emit('message', btpMessage)
-      this.clock.tick(150)
-      await sleep(10)
-      assert.equal(this.pluginState.incomingPaymentChannelId,
-        this.incomingPaymentChannelId)
-    })
-
-    it('sends outgoing payment channel id', async function () {
-      this.mockSocket
-        .reply(btpPacket.TYPE_MESSAGE, ({requestId}) => {
-          return btpPacket.serializeResponse(requestId, this.payChanIdResponse)
-        })
-        .reply(btpPacket.TYPE_RESPONSE, ({requestId, data}) => {
-          assert.equal(requestId, 1234)
-          assert.lengthOf(data.protocolData, 1)
-          assert.equal(data.protocolData[0].protocolName, 'ripple_channel_id')
-          assert.equal(data.protocolData[0].contentType, btpPacket.MIME_APPLICATION_JSON)
-          const actualChanId = JSON.parse(data.protocolData[0].data.toString('utf8'))
-          assert.equal(actualChanId, this.pluginState.outgoingPaymentChannelId)
-        })
-
-      await this.plugin.connect()
-
-      const btpMessage = btpPacket.serializeMessage(1234, this.payChanIdRequest)
-      this.mockSocket.emit('message', btpMessage)
-    })
-
-    describe('validates incoming pay chan', function () {
-      beforeEach(function () {
-        this.originalIncomingChannel = this.pluginState.api
-          .getPaymentChannel(this.incomingPaymentChannelId)
-
-        this.wrongDestinationAddress = Object.assign({}, this.originalIncomingChannel,
-          { destination: 'rNotThisPluginsAddress' })
-        this.cancelAfterTooSoon = Object.assign({}, this.originalIncomingChannel,
-          { cancelAfter: new Date().toISOString() })
-        this.expirationTooSoon = Object.assign({}, this.originalIncomingChannel,
-          { expiration: new Date().toISOString() })
-        this.settleDelayTooLow = Object.assign({}, this.originalIncomingChannel,
-          { settleDelay: 10 })
-
-        this.mockSocket.reply(btpPacket.TYPE_MESSAGE, ({requestId}) => {
-          return btpPacket.serializeResponse(requestId, this.payChanIdResponse)
-        })
-      })
-
-      it(`throws if the incoming channel's settleDelay is too low`, function () {
-        sinon.stub(this.pluginState.api, 'getPaymentChannel').onSecondCall()
-          .returns(this.settleDelayTooLow)
-
-        return expect(this.plugin.connect()).to.be
-          .rejectedWith('settle delay of incoming payment channel too low')
-      })
-
-      it('throws if cancelAfter is set', function () {
-        // onSecondCall() because the first call loads the outoing channel. Only the second loads the incoming channel.
-        sinon.stub(this.pluginState.api, 'getPaymentChannel').onSecondCall().returns(this.cancelAfterTooSoon)
-        return expect(this.plugin.connect()).to.be.rejectedWith('incoming paychan expires (.cancelAfter is set)')
-      })
-
-      it('throws if expiration is too soon', function () {
-        // onSecondCall() because the first call loads the outoing channel. Only the second loads the incoming channel.
-        sinon.stub(this.pluginState.api, 'getPaymentChannel').onSecondCall().returns(this.expirationTooSoon)
-        return expect(this.plugin.connect()).to.be.rejectedWith('incoming paychan expires (.expiration is set)')
-      })
-
-      it('throws if destination address is not the plugin\'s', function () {
-        // onSecondCall() because the first call loads the outoing channel. Only the second loads the incoming channel.
-        sinon.stub(this.pluginState.api, 'getPaymentChannel').onSecondCall().returns(this.wrongDestinationAddress)
-        return expect(this.plugin.connect()).to.be.rejectedWith('Channel destination address wrong')
-      })
-    })
-  })
-
-  describe('handleIncomingPrepare', function () {
-    beforeEach(function () {
-      this.transfer = {
-        id: '1d4958c6-eb7f-44ac-8ab7-2d87dee96002',
-        amount: 123456,
-        executionCondition: Buffer.from('27E73D639C4739E9B209BECC9FAED2026F09236E899747B29A6EEBFE6A91C53A', 'hex'),
-        expiresAt: '2017-12-20T16:03:03.763Z',
-        to: 'g.eur.mytrustline.rQBHyjckUFGZK1nPDKzTU8Zyvd2niqHcpo',
-        from: 'g.eur.mytrustline.rPZUg1NH7gAfkpRpKbcwyn8ET7EPqhTFiv',
-        ledger: 'g.eur.mytrustline.'
-      }
-    })
-
-    it('does not accept an incoming prepare without incoming paychan', async function () {
-      this.mockSocket.reply(btpPacket.TYPE_MESSAGE, ({requestId, data}) => {
-        return btpPacket.serializeResponse(requestId, this.payChanIdResponseNull)
-      })
-
-      await this.plugin.connect()
-      return expect(this.plugin._paychan.handleIncomingPrepare(this.pluginContext, this.transfer))
-        .to.eventually.be.rejectedWith('incoming payment channel must be established before incoming transfers are processed')
-    })
-
-    it('does not accept an incoming prepare if incoming paychan is closing', async function () {
-      await _connectPlugin.call(this)
-      const closingChannel = Object.assign({}, this.pluginState.api.getPaymentChannel(this.incomingPaymentChannelId),
-        { expiration: new Date().toISOString() })
-      sinon.stub(this.pluginState.api, 'getPaymentChannel').returns(closingChannel)
-      sinon.stub(this.plugin, 'disconnect').throws('something went very wrong')
-
-      this.clock.tick(DEFAULT_WATCHER_INTERVAL)
-      await sleep(50)
-
-      return expect(this.plugin._paychan.handleIncomingPrepare(this.pluginContext, this.transfer))
-        .to.eventually.be.rejectedWith('cannot process transfer for a payment channel that is closing')
-    })
-  })
-
-  describe('incoming claim', function () {
-    beforeEach(async function () {
-      this.mockSocket.reply(btpPacket.TYPE_MESSAGE, ({requestId}) => {
-        return btpPacket.serializeResponse(requestId, this.payChanIdResponse)
-      })
-      await this.plugin.connect()
-    })
-
-    it('handles an incoming claim', async function () {
-      await this.plugin._paychan.handleIncomingClaim(this.pluginContext, this.claim)
-
-      const max = await this.pluginState.incomingClaim.getMax()
-      assert.equal(max.value, this.claim.amount)
-      assert.equal(max.data, this.claim.signature)
-    })
-
-    it('rejects an incoming claim with invalid signature', async function () {
-      this.claim.signature = 'INVALID'
-      try {
-        await this.plugin._paychan.handleIncomingClaim(this.pluginContext, this.claim)
-      } catch (err) {
-        assert.equal(err.message, 'got invalid claim signature INVALID for amount 5 drops')
-        return
-      }
-      assert(false, 'should reject claim')
-    })
-
-    it('rejects an incoming claim that exceeds the channel amount', async function () {
-      try {
-        await this.plugin._paychan.handleIncomingClaim(this.pluginContext, this.exceedingClaim)
-      } catch (err) {
-        assert.equal(err.message, 'got claim for amount higher than channel balance. amount: 5000000, incoming channel balance: 100000')
-        return
-      }
-      assert(false, 'should reject claim')
-    })
-  })
-
-  describe('outgoing claim', function () {
-    beforeEach(async function () {
-      this.mockSocket.reply(btpPacket.TYPE_MESSAGE, ({requestId}) => {
-        return btpPacket.serializeResponse(requestId, this.payChanIdResponse)
-      })
-      await this.plugin.connect()
-    })
-
-    it('creates a claim', async function () {
-      const expectClaim = {
-        amount: this.pluginState.maxAmount,
-        signature: '7d23bdbe1fcec7e1b1a535e9df07cc7f50fa6d0e148db3b16d43619fc5e8254085ad622afd1bcee0ef5311d51f0bc23a6d9aacb6893a6ba00b340718420a160d'
-      }
-      const claim = await this.plugin._paychan.createOutgoingClaim(this.pluginContext, this.pluginState.maxAmount)
-      assert.deepEqual(claim, expectClaim)
-    })
-
-    it('adds funding if channel runs dry', async function () {
-      const prepareSpy = sinon.spy(this.pluginState.api, 'preparePaymentChannelFund')
-      const submitSpy = sinon.spy(this.pluginState.api, 'submit')
-
-      await this.plugin._paychan.createOutgoingClaim(this.pluginContext, this.pluginState.maxAmount) // exceeds the configured funding threshold
-
-      expect(prepareSpy).to.have.been.calledWith(this.opts.address, {
-        amount: dropsToXrp(this.opts.maxAmount),
-        channel: String(this.pluginState.outgoingPaymentChannelId)
-      })
-      expect(submitSpy).to.have.been.calledWith('1234567890ABCDEF')
-      setImmediate(() => { // wait for the callback to update maxAmount
-        expect(this.pluginState.maxAmount).to.be.equal('200000000')
-      })
-    })
-  })
-
-  describe('submits claims', function () {
-    beforeEach(async function () {
-      this.mockSocket.reply(btpPacket.TYPE_MESSAGE, ({requestId}) => {
-        return btpPacket.serializeResponse(requestId, this.payChanIdResponse)
-      })
-      await this.plugin.connect()
-    })
-
-    it.skip('submits a claim if maxUnsecured is exceeded', function () {
-
-    })
-  })
-
-  describe('disconnect', function () {
-    beforeEach(async function () {
-      this.mockSocket.reply(btpPacket.TYPE_MESSAGE, ({requestId}) => {
-        return btpPacket.serializeResponse(requestId, this.payChanIdResponse)
-      })
-      await this.plugin.connect()
-    })
-
-    it('submits claim on disconnect', async function () {
-      const prepareSpy = sinon.spy(this.pluginState.api, 'preparePaymentChannelClaim')
-      const submitSpy = sinon.spy(this.pluginState.api, 'submit')
-
-      await this.plugin._paychan.handleIncomingClaim(this.pluginContext, this.claim)
-      await this.plugin.disconnect()
-
-      expect(prepareSpy).to.be.calledWith(this.opts.address, {
-        balance: dropsToXrp(this.claim.amount),
-        channel: String(this.incomingPaymentChannelId),
-        signature: this.claim.signature.toUpperCase(),
-        publicKey: 'ED' + apiHelper.PEER_PUBLIC_KEY
-      })
-      expect(submitSpy).to.be.calledAfter(prepareSpy)
-        .and.calledWith('1234567890ABCDEF')
-    })
-
-    it('disconnects if incoming channel closes', async function () {
-      const closingChannel = Object.assign({}, this.pluginState.api.getPaymentChannel(this.incomingPaymentChannelId),
-        { expiration: new Date().toISOString() })
-      sinon.stub(this.pluginState.api, 'getPaymentChannel').returns(closingChannel)
-
-      this.clock.tick(DEFAULT_WATCHER_INTERVAL)
-      await sleep(50)
-      assert.isFalse(this.plugin.isConnected())
-    })
-  })
-})
diff --git a/test/integration/rippled-integration.js b/test/integration/rippled-integration.js
index 073706c..8c51382 100644
--- a/test/integration/rippled-integration.js
+++ b/test/integration/rippled-integration.js
@@ -6,13 +6,12 @@ chai.use(chaiAsPromised)
 const assert = chai.assert
 const expect = chai.expect
 
+const ilpPacket = require('ilp-packet')
 const crypto = require('crypto')
-const uuid = require('uuid')
-const base64url = require('base64url')
 const BigNumber = require('bignumber.js')
 const PluginRipple = require('../../index.js')
 const RippleAPI = require('ripple-lib').RippleAPI
-const Store = require('ilp-plugin-payment-channel-framework/test/helpers/objStore')
+const Store = require('ilp-store-memory')
 const {payTo, ledgerAccept} = require('./utils')
 const { sleep, dropsToXrp } = require('../../src/lib/constants')
 
@@ -23,7 +22,7 @@ const COMMON_OPTS = {
   token: 'shared_secret',
   rippledServer: SERVER_URL,
   maxUnsecured: '5000',
-  maxAmount: '100000',
+  channelAmount: 100000,
   fundThreshold: '0.9'
 }
 
@@ -88,42 +87,26 @@ describe('plugin integration', function () {
   beforeEach(async function () {
     await setup.call(this, SERVER_URL)
 
-    const sharedSecret = 'shh its a secret'
+    const sharedSecret = 'secret'
     const serverHost = 'localhost'
     const serverPort = 3000
 
     this.plugin = new PluginRipple(Object.assign({}, COMMON_OPTS, {
-      // This plugin's ripple address and secret.
-      // Get testnet credentials at https://ripple.com/build/xrp-test-net/
       address: this.newWallet.address,
       secret: this.newWallet.secret,
-
-      // The peer you want to start a payment channel with
       peerAddress: this.peer.address,
-
-      // Our peer acts as BTP server. This is the address he is listening on
       server: `btp+ws://:${sharedSecret}@${serverHost}:${serverPort}`,
-
-      // Other options. For details see:
-      // https://github.com/interledger/rfcs/blob/master/0004-ledger-plugin-interface/0004-ledger-plugin-interface.md#class-pluginoptions
       _store: new Store()
     }))
     this.peerPlugin = new PluginRipple(Object.assign({}, COMMON_OPTS, {
-      // This plugin's ripple address and secret.
-      // Get testnet credentials at https://ripple.com/build/xrp-test-net/
       address: this.peer.address,
       secret: this.peer.secret,
-
-      // The peer you want to start a payment channel with
       peerAddress: this.newWallet.address,
-
-      // Other options. For details see:
-      // https://github.com/interledger/rfcs/blob/master/0004-ledger-plugin-interface/0004-ledger-plugin-interface.md#class-pluginoptions
       _store: new Store(),
       listener: {
-        port: serverPort
+        port: serverPort,
+        secret: sharedSecret
       },
-      incomingSecret: sharedSecret,
       prefix: 'g.xrp.mypaychan.',
       info: {
         prefix: 'g.xrp.mypaychan.',
@@ -133,7 +116,8 @@ describe('plugin integration', function () {
       }
     }))
 
-    this.pluginState = this.plugin._paychanContext.state
+    // this.plugin.registerDataHandler(() => {})
+    // this.peerPlugin.registerDataHandler(() => {})
 
     // automatically accept the ledger when api.submit() is called
     const autoAcceptLedger = (api) => {
@@ -145,9 +129,8 @@ describe('plugin integration', function () {
         })
       }
     }
-
-    autoAcceptLedger(this.plugin._paychanContext.state.api)
-    autoAcceptLedger(this.peerPlugin._paychanContext.state.api)
+    autoAcceptLedger(this.plugin._api)
+    autoAcceptLedger(this.peerPlugin._api)
   })
   afterEach(teardown)
 
@@ -155,22 +138,21 @@ describe('plugin integration', function () {
     it('is eventually fulfilled', async function () {
       const connectPromise = Promise.all([this.peerPlugin.connect(),
         this.plugin.connect()])
-      await sleep(10)
       return expect(connectPromise).to.be.eventually.fulfilled
     })
 
     it('creates an outgoing paychan', async function () {
       await connectPlugins(this.peerPlugin, this.plugin)
 
-      const paychanid = await this.pluginState.outgoingChannel.getMax()
-      const chan = await this.api.getPaymentChannel(paychanid.data)
+      const paychanid = this.plugin._outgoingChannel
+      const chan = await this.api.getPaymentChannel(paychanid)
 
       assert.strictEqual(chan.account, this.newWallet.address)
-      assert.strictEqual(chan.amount, dropsToXrp(COMMON_OPTS.maxAmount))
+      assert.strictEqual(chan.amount, dropsToXrp(COMMON_OPTS.channelAmount))
       assert.strictEqual(chan.balance, '0')
       assert.strictEqual(chan.destination, this.peer.address)
       assert.strictEqual(chan.settleDelay, COMMON_OPTS.settleDelay)
-      const expectedPubKey = 'ED' + Buffer.from(this.pluginState.keyPair.publicKey)
+      const expectedPubKey = 'ED' + Buffer.from(this.plugin._keyPair.publicKey)
         .toString('hex').toUpperCase()
       assert.strictEqual(chan.publicKey, expectedPubKey)
     })
@@ -178,17 +160,16 @@ describe('plugin integration', function () {
     it('has an incoming paychan', async function () {
       await connectPlugins(this.peerPlugin, this.plugin)
 
-      const paychanid = this.pluginState.incomingPaymentChannelId
+      const paychanid = this.plugin._incomingChannel
       const chan = await this.api.getPaymentChannel(paychanid)
 
       assert.strictEqual(chan.account, this.peer.address)
-      assert.strictEqual(chan.amount, dropsToXrp(COMMON_OPTS.maxAmount))
+      assert.strictEqual(chan.amount, dropsToXrp(COMMON_OPTS.channelAmount))
       assert.strictEqual(chan.balance, '0')
       assert.strictEqual(chan.destination, this.newWallet.address)
       assert.strictEqual(chan.settleDelay, COMMON_OPTS.settleDelay)
 
-      const pubKeyUIntA = this.peerPlugin._paychanContext.state.keyPair.publicKey
-      const expectedPubKey = 'ED' + Buffer.from(pubKeyUIntA)
+      const expectedPubKey = 'ED' + Buffer.from(this.peerPlugin._keyPair.publicKey)
         .toString('hex').toUpperCase()
       assert.strictEqual(chan.publicKey, expectedPubKey)
     })
@@ -202,79 +183,80 @@ describe('plugin integration', function () {
         accounts: [ this.newWallet.address, this.peer.address ]
       })
 
-      this.fulfillment = crypto.randomBytes(32)
+      this.fulfillment = Buffer.from('E4840A1A3C50A1635CC53F637721114BEBAF3EAB02FE1AC7C97A6F100311A3ED', 'hex')
       this.transfer = {
-        id: uuid(),
-        ledger: this.plugin.getInfo().prefix,
-        from: this.plugin.getAccount(),
-        to: this.plugin.getPeerAccount(),
-        expiresAt: new Date(Date.now() + 10000).toISOString(),
-        amount: '5',
-        custom: {
-          field: 'some stuff'
-        },
-        executionCondition: base64url(crypto
-          .createHash('sha256')
-          .update(this.fulfillment)
-          .digest())
+        amount: '10',
+        expiresAt: new Date(Date.now() + 10000),
+        executionCondition: crypto.createHash('sha256').update(this.fulfillment).digest(),
+        destination: 'peer.example',
+        data: Buffer.from('hello world')
       }
 
-      this.autoFulfill = new Promise((resolve, reject) => {
-        this.peerPlugin.on('incoming_prepare', async (transfer) => {
-          await this.peerPlugin.fulfillCondition(
-            transfer.id,
-            base64url(this.fulfillment)
-          )
-          resolve()
+      // this.transfer = {
+      //   id: uuid(),
+      //   ledger: this.plugin.getInfo().prefix,
+      //   from: this.plugin.getAccount(),
+      //   to: this.plugin.getPeerAccount(),
+      //   expiresAt: new Date(Date.now() + 10000).toISOString(),
+      //   amount: '5',
+      //   custom: {
+      //     field: 'some stuff'
+      //   },
+      // executionCondition: base64url(crypto
+      //   .createHash('sha256')
+      //   .update(this.fulfillment)
+      //   .digest())
+      // }
+
+      // this.autoFulfill = new Promise((resolve, reject) => {
+      //   this.peerPlugin.on('incoming_prepare', async (transfer) => {
+      //     await this.peerPlugin.fulfillCondition(
+      //       transfer.id,
+      //       base64url(this.fulfillment)
+      //     )
+      //     resolve()
+      //   })
+      // })
+      // 
+      this.peerPlugin.registerDataHandler((ilp) => {
+        return ilpPacket.serializeIlpFulfill({
+          fulfillment: this.fulfillment,
+          data: Buffer.from('hello world again')
         })
       })
     })
 
     it('submits a claim on disconnect', async function () {
-      await this.plugin.sendTransfer(this.transfer)
-      await this.autoFulfill
-      const peerBalance = await this.peerPlugin.getBalance()
+      await this.plugin.sendMoney(this.transfer.amount)
 
       // disconnect() makes the plugin submit a claim
       await this.peerPlugin.disconnect()
 
       // assert that the balance on-ledger was adjusted
-      const paychanid = await this.pluginState.outgoingChannel.getMax()
-      const chan = await this.api.getPaymentChannel(paychanid.data)
+      const paychanid = this.plugin._outgoingChannel
+      const chan = await this.api.getPaymentChannel(paychanid)
       assert.strictEqual(chan.balance, dropsToXrp(this.transfer.amount))
-
-      // assert that the plugins' stored balance matches the on-ledger balance
-      assert.strictEqual(peerBalance, this.transfer.amount)
-      assert.equal(await this.plugin.getBalance(), -1 * parseInt(this.transfer.amount))
     })
 
     it('funds a paychan', async function () {
-      const chanId = this.pluginState.outgoingPaymentChannelId
-      this.transfer.amount = COMMON_OPTS.maxUnsecured
-      const expectedFundingThreshold = parseInt(COMMON_OPTS.maxAmount) *
-        parseFloat(COMMON_OPTS.fundThreshold)
-
-      // send transfers until the funding threshold is exceeded
-      while (parseFloat(await this.peerPlugin.getBalance()) <= expectedFundingThreshold) {
-        // assert that the plugin has not yet issued a funding tx
-        const chan = await this.api.getPaymentChannel(chanId)
-        assert(chan.amount, dropsToXrp(COMMON_OPTS.maxAmount))
-
-        this.transfer.id = uuid()
-        await this.plugin.sendTransfer(this.transfer)
-        await new Promise((resolve, reject) => {
-          this.plugin.on('outgoing_fulfill', () => resolve())
-        })
-      }
-
-      const expectedAmount = new BigNumber(dropsToXrp(COMMON_OPTS.maxAmount))
-        .mul(2).toString()
-      await new Promise((resolve, reject) => {
+      const expectedAmount = new BigNumber(dropsToXrp(COMMON_OPTS.channelAmount)).times(2)
+      const ledgerClose = new Promise((resolve, reject) => {
         this.api.connection.on('ledgerClosed', async (ev) => {
-          const chan = await this.api.getPaymentChannel(chanId)
-          if (chan.amount === expectedAmount) resolve()
+          const chan = await this.api.getPaymentChannel(this.plugin._outgoingChannel)
+          assert.equal(chan.amount, expectedAmount, 'Channel does not have expected amount')
+          resolve()
         })
       })
+
+      // assert that the channel has the initial amount
+      const chan = await this.api.getPaymentChannel(this.plugin._outgoingChannel)
+      assert.equal(chan.amount, dropsToXrp(COMMON_OPTS.channelAmount))
+
+      // send a transfer that triggers a funding tx
+      const expectedFundingThreshold = parseInt(COMMON_OPTS.channelAmount) *
+        parseFloat(COMMON_OPTS.fundThreshold) + 1
+      await this.plugin.sendMoney(expectedFundingThreshold)
+      return ledgerClose
     })
   })
 })
diff --git a/test/pluginSpec.js b/test/pluginSpec.js
new file mode 100644
index 0000000..2b2320f
--- /dev/null
+++ b/test/pluginSpec.js
@@ -0,0 +1,384 @@
+'use strict'
+const Plugin = require('..')
+const Store = require('ilp-store-memory')
+const BtpPacket = require('btp-packet')
+const { util } = require('ilp-plugin-xrp-paychan-shared')
+const nacl = require('tweetnacl')
+
+const EventEmitter = require('events')
+const chai = require('chai')
+const chaiAsPromised = require('chai-as-promised')
+chai.use(chaiAsPromised)
+const sinon = require('sinon')
+const sinonChai = require('sinon-chai')
+chai.use(sinonChai)
+
+const assert = chai.assert
+
+// peer secretn spCWi5W9SmYYsaDin9Zqe64C27i
+
+describe('Plugin XRP Paychan Symmetric', function () {
+  beforeEach(function () {
+    this.sinon = sinon.sandbox.create()
+    this.plugin = new Plugin({
+      xrpServer: 'wss://s.altnet.rippletest.net:51233',
+      secret: 'sahNtietWCRzmX7Z2Zy7Z3EsvFDjv',
+      address: 'ra3h9tzcipHTZCdQesMthfx4iBZNEEuHXG',
+      peerAddress: 'rKwCnwtM6et7BVaCZm97hbU8oXkoohReea',
+      _store: new Store()
+    })
+
+    this.sinon.stub(util, 'encodeClaim').returns('abcdefg')
+    this.sinon.stub(nacl.sign, 'detached').returns('abcdefg')
+
+    this.ilpData = {
+      protocolData: [{
+        protocolName: 'ilp',
+        contentType: BtpPacket.MIME_APPLICATION_OCTET_STREAM,
+        data: Buffer.alloc(0)
+      }]
+    }
+
+    this.channel = {
+      settleDelay: util.MIN_SETTLE_DELAY + 1,
+      destination: this.plugin._address,
+      publicKey: 'abcdefg',
+      balance: '100',
+      amount: '1000'
+    }
+
+    this.signStub = this.sinon.stub(this.plugin._api, 'sign').returns({ signedTransaction: '123' })
+
+    this.submitStub = this.sinon.stub(this.plugin._api, 'submit').callsFake(() => {
+      setImmediate(() => {
+        this.plugin._api.connection.emit('transaction', {
+          transaction: {
+            Sequence: 1,
+            SourceTag: 1,
+            Account: this.plugin._address,
+            Destination: this.plugin._peerAddress,
+            Channel: null
+          },
+          engine_result: 'tesSUCCESS'
+        })
+      })
+      return {
+        resultCode: 'tesSUCCESS',
+        resultMessage: 'Successful'
+      }
+    })
+  })
+
+  afterEach(function () {
+    this.sinon.restore()
+  })
+
+  describe('_handleData', function () {
+    it('should handle ilp data', async function () {
+      let handled = false
+      this.plugin.registerDataHandler(data => {
+        assert.deepEqual(data, Buffer.alloc(0))
+        handled = true
+        return Buffer.from('test_result')
+      })
+
+      const result = await this.plugin._handleData(null, {
+        requestId: 1,
+        data: this.ilpData
+      })
+
+      assert.isTrue(handled, 'handler should have been called')
+      assert.deepEqual(result, [{
+        protocolName: 'ilp',
+        contentType: BtpPacket.MIME_APPLICATION_OCTET_STREAM,
+        data: Buffer.from('test_result')
+      }], 'result should contain the buffer returned by data handler')
+    })
+
+    it('should throw an error if there is no data handler', async function () {
+      await assert.isRejected(this.plugin._handleData(null, {
+        requestId: 1,
+        data: this.ilpData
+      }), /no request handler registered/)
+    })
+
+    it('should handle ripple_channel_id protocol', async function () {
+      // no need to look at the ledger in this test
+      this.sinon.stub(this.plugin, '_reloadIncomingChannelDetails').callsFake(() => Promise.resolve())
+      this.plugin._outgoingChannel = 'my_channel_id'
+
+      const result = await this.plugin._handleData(null, {
+        requestId: 1,
+        data: {
+          protocolData: [{
+            protocolName: 'ripple_channel_id',
+            contentType: BtpPacket.MIME_TEXT_PLAIN_UTF8,
+            data: Buffer.from('peer_channel_id')
+          }]
+        }
+      })
+
+      assert.equal(this.plugin._incomingChannel, 'peer_channel_id', 'incoming channel should be set')
+      assert.deepEqual(result, [{
+        protocolName: 'ripple_channel_id',
+        contentType: BtpPacket.MIME_TEXT_PLAIN_UTF8,
+        data: Buffer.from(this.plugin._outgoingChannel)
+      }], 'result should contain outgoing channel')
+    })
+  })
+
+  describe('_reloadIncomingChannelDetails', function () {
+    beforeEach(function () {
+      this.plugin._outgoingChannel = 'my_channel_id'
+      this.plugin._incomingChannel = 'peer_channel_id'
+    })
+
+    it('should return if it cannot query the peer for a channel', async function () {
+      // simulate the plugin not being able to get incoming channel
+      this.plugin._incomingChannel = null
+      const stub = this.sinon.stub(this.plugin, '_call').callsFake(() => Promise.resolve({ protocolData: [] }))
+      const spy = this.sinon.spy(this.plugin._api, 'getPaymentChannel')
+
+      await this.plugin._reloadIncomingChannelDetails()
+
+      assert.isTrue(stub.called, 'should have tried to query peer for balance')
+      assert.isTrue(spy.notCalled, 'should not have reached getPaymentChannel')
+    })
+
+    it('should return if getPaymentChannel gives a rippled error', async function () {
+      const stub = this.sinon.stub(this.plugin._api, 'getPaymentChannel')
+        .callsFake(() => {
+          throw new Error('there was an error!')
+        })
+
+      await this.plugin._reloadIncomingChannelDetails()
+      assert.isTrue(stub.called, 'should have queried ledger for paychan')
+    })
+
+    it('should throw if settleDelay is too soon', async function () {
+      this.channel.settleDelay = util.MIN_SETTLE_DELAY - 1
+      this.sinon.stub(this.plugin._api, 'getPaymentChannel')
+        .resolves(this.channel)
+
+      await assert.isRejected(this.plugin._reloadIncomingChannelDetails(),
+        /settle delay of incoming payment channel too low/)
+    })
+
+    it('should throw if cancelAfter is specified', async function () {
+      this.channel.cancelAfter = Date.now() + 1000
+      this.sinon.stub(this.plugin._api, 'getPaymentChannel')
+        .resolves(this.channel)
+
+      await assert.isRejected(this.plugin._reloadIncomingChannelDetails(),
+        /cancelAfter must not be set/)
+    })
+
+    it('should throw if expiration is specified', async function () {
+      this.channel.expiration = Date.now() + 1000
+      this.sinon.stub(this.plugin._api, 'getPaymentChannel')
+        .resolves(this.channel)
+
+      await assert.isRejected(this.plugin._reloadIncomingChannelDetails(),
+        /expiration must not be set/)
+    })
+
+    it('should throw if destination does not match our account', async function () {
+      this.channel.destination = this.plugin._peerAddress
+      this.sinon.stub(this.plugin._api, 'getPaymentChannel')
+        .resolves(this.channel)
+
+      await assert.isRejected(this.plugin._reloadIncomingChannelDetails(),
+        /Channel destination address wrong/)
+    })
+
+    it('should return if all details are ok', async function () {
+      this.sinon.stub(this.plugin._api, 'getPaymentChannel')
+        .resolves(this.channel)
+
+      await this.plugin._reloadIncomingChannelDetails()
+      assert.isTrue(!!this.plugin._claimIntervalId,
+        'claim interval should be started if reload was successful')
+    })
+  })
+
+  describe('_connect', function () {
+    beforeEach(function () {
+      // mock out the rippled connection
+      this.plugin._api.connection = new EventEmitter()
+      this.plugin._api.connection.request = () => Promise.resolve(null)
+      this.sinon.stub(this.plugin._api, 'connect').resolves(null)
+
+      this.channelId = '945BB98D2F03DFA2AED810F8917B2BC344C0AA182A5DB506C16F84593C24244F'
+      this.tagStub = this.sinon.stub(util, 'randomTag').returns(1)
+      this.prepareStub = this.sinon.stub(this.plugin._api, 'preparePaymentChannelCreate').resolves({ txJSON: '{}' })
+
+      this.loadStub = this.sinon.stub(this.plugin._api, 'getPaymentChannel')
+        .callsFake(id => {
+          assert.equal(id, this.channelId)
+          return Promise.resolve(this.channel)
+        })
+
+      this.reloadStub = this.sinon.stub(this.plugin, '_reloadIncomingChannelDetails')
+        .resolves(null)
+    })
+
+    it('should load outgoing channel if exists', async function () {
+      this.plugin._store.load('outgoing_channel')
+      this.plugin._store.set('outgoing_channel', this.channelId)
+
+      await this.plugin._connect()
+
+      assert.isTrue(this.loadStub.called, 'should have loaded outgoing channel')
+      assert.isTrue(this.reloadStub.called, 'should have reloaded incoming channel')
+    })
+
+    it('should prepare a payment channel', async function () {
+      await this.plugin._connect()
+
+      assert.isTrue(this.tagStub.called, 'should have generated source tag')
+      assert.isTrue(this.prepareStub.called, 'should have generated prepare tx')
+      assert.isTrue(this.signStub.called, 'should have signed xrp tx')
+      assert.isTrue(this.submitStub.called, 'should have submitted tx to ledger')
+      assert.isTrue(this.loadStub.called, 'should have loaded outgoing channel')
+      assert.isTrue(this.reloadStub.called, 'should have reloaded incoming channel')
+    })
+  })
+
+  describe('_claimFunds', function () {
+    beforeEach(function () {
+      this.plugin._incomingClaim = {
+        amount: '100',
+        signature: 'some signature'
+      }
+
+      this.plugin._incomingChannelDetails = this.channel
+      this.prepareStub = this.sinon.stub(this.plugin._api, 'preparePaymentChannelClaim')
+        .resolves({ txJSON: '{}' })
+    })
+
+    it('should return if incomingClaim has no signature', async function () {
+      delete this.plugin._incomingClaim.signature
+
+      await this.plugin._claimFunds()
+
+      assert.isFalse(this.prepareStub.called, 'should not have prepared a claim tx with no signature')
+    })
+
+    it('should submit tx if incomingClaim is valid', async function () {
+      await this.plugin._claimFunds()
+
+      assert.isTrue(this.prepareStub.called, 'tx should be prepared')
+      assert.isTrue(this.signStub.called, 'tx should be signed')
+      assert.isTrue(this.submitStub.called, 'transaction should be submitted to ledger')
+    })
+  })
+
+  describe('_disconnect', function () {
+    beforeEach(function () {
+      this.plugin._claimIntervalId = setInterval(() => {}, 5000)
+      this.claimStub = this.sinon.stub(this.plugin, '_claimFunds')
+      this.disconnectStub = this.sinon.stub(this.plugin._api, 'disconnect')
+    })
+
+    afterEach(function () {
+      assert.isTrue(this.claimStub.called, 'should have claimed funds')
+      assert.isTrue(this.disconnectStub.called, 'should have disconnected api')
+    })
+
+    it('should claim and disconnect the api', async function () {
+      await this.plugin._disconnect()
+    })
+
+    it('should still disconnect if claim fails', async function () {
+      this.claimStub.throws()
+      await this.plugin._disconnect()
+    })
+
+    it('should still disconnect if api disconnect fails', async function () {
+      this.disconnectStub.throws()
+      await this.plugin._disconnect()
+    })
+  })
+
+  describe('_sendMoney', function () {
+    beforeEach(function () {
+      this.plugin._funding = true // turn off the funding path
+      this.plugin._outgoingChannel = 'my_channel_id'
+      this.plugin._outgoingClaim = { amount: '0' }
+      this._outgoingClaim = {
+        amount: '100',
+        signature: '61626364656667'
+      }
+    })
+
+    it('should sign a claim and submit it to the other side', async function () {
+      this.sinon.stub(this.plugin, '_call').callsFake((from, data) => {
+        // forgive me
+        assert.deepEqual(data.data.protocolData[0].data,
+          Buffer.from(JSON.stringify(this._outgoingClaim)))
+      })
+
+      await this.plugin.sendMoney(100)
+    })
+  })
+
+  describe('_handleMoney', function () {
+    beforeEach(function () {
+      this.claimAmount = '100'
+      this.claimSignature = 'abcdefg'
+      this.claimData = () => ({
+        amount: '100',
+        protocolData: [{
+          protocolName: 'claim',
+          contentType: BtpPacket.MIME_APPLICATION_JSON,
+          data: JSON.stringify({
+            amount: this.claimAmount,
+            signature: this.claimSignature
+          })
+        }]
+      })
+
+      this.plugin._incomingChannelDetails = this.channel
+      this.plugin._incomingClaim = {
+        amount: '0',
+        signature: 'abcdefg'
+      }
+
+      this.naclStub = this.sinon.stub(nacl.sign.detached, 'verify').returns(true)
+    })
+
+    it('throws an error if new claim is less than old claim', async function () {
+      this.plugin._incomingClaim.amount = '100'
+      await assert.isRejected(
+        this.plugin._handleMoney(null, { requestId: 1, data: this.claimData() }),
+        /new claim is less than old claim. new=100 old=100/)
+    })
+
+    it('throws an error if the signature is not valid', async function () {
+      this.naclStub.throws()
+      await assert.isRejected(
+        this.plugin._handleMoney(null, { requestId: 1, data: this.claimData() }),
+        /got invalid claim signature abcdefg for amount 100 drops total/)
+    })
+
+    it('throws an error if the claim is for more than the channel capacity', async function () {
+      this.plugin._incomingChannelDetails.amount = '0.000001'
+      await assert.isRejected(
+        this.plugin._handleMoney(null, { requestId: 1, data: this.claimData() }),
+        /got claim for amount higher than channel balance. amount: 100 incoming channel amount: 1/)
+    })
+
+    it('calls the money handler on success', async function () {
+      let handled = false
+      this.plugin.registerMoneyHandler(amount => {
+        assert.deepEqual(amount, '100')
+        handled = true
+        return Buffer.from('test_result')
+      })
+
+      await this.plugin._handleMoney(null, { requestId: 1, data: this.claimData() })
+
+      assert.isTrue(handled, 'handler should have been called')
+    })
+  })
+})
diff --git a/test/scripts/test.js b/test/scripts/test.js
new file mode 100644
index 0000000..9f4eccc
--- /dev/null
+++ b/test/scripts/test.js
@@ -0,0 +1,89 @@
+const BtpPlugin = require('../..')
+const IlpPacket = require('ilp-packet')
+
+process.on('unhandledRejection', (e) => {
+  console.error('unhandledRejection', e)
+})
+
+class Store {
+  constructor () {
+    this._store = {}
+  }
+
+  async get (k) {
+    return this._store[k]
+  }
+
+  async put (k, v) {
+    this._store[k] = v
+  }
+
+  async del (k) {
+    delete this._store[k]
+  }
+}
+
+const server = new BtpPlugin({
+  listener: {
+    port: 9000,
+    secret: 'secret'
+  },
+  rippledServer: 'wss://s.altnet.rippletest.net:51233',
+  peerAddress: 'raYsh5o2YXvuZKj6xYyuHNitUTzT8dWKYE',
+  secret: 'snUNeZeq4QRqefSh7oydUSWZv1uh3',
+  _store: new Store()
+})
+const client = new BtpPlugin({
+  server: 'btp+ws://:secret@localhost:9000',
+  rippledServer: 'wss://s.altnet.rippletest.net:51233',
+  peerAddress: 'rW1XrgCvURLdPkdVsQhmWsRqtgMnApepK',
+  secret: 'sspGuk1g9KPX4ac8oq9MDsW5QUsQM',
+  _store: new Store()
+})
+
+async function run () {
+  await Promise.all([
+    server.connect(),
+    client.connect()
+  ])
+
+  server.registerDataHandler((ilp) => {
+    console.log('server got:', IlpPacket.deserializeIlpPacket(ilp))
+    return IlpPacket.serializeIlpFulfill({
+      fulfillment: Buffer.alloc(32),
+      data: Buffer.from('hello world again')
+    })
+  })
+
+  const response = await client.sendData(IlpPacket.serializeIlpPrepare({
+    amount: '10',
+    expiresAt: new Date(),
+    executionCondition: Buffer.alloc(32),
+    destination: 'peer.example',
+    data: Buffer.from('hello world')
+  }))
+
+  console.log('client got:', IlpPacket.deserializeIlpPacket(response))
+
+  await server.sendMoney(10)
+  await client.sendMoney(10)
+
+  console.log('sent money')
+  console.log('testing reconciliation')
+
+  server._incomingClaim = { amount: '0' } // simulate out of sync behavior
+  await client.sendMoney(10) // this call should warn about discrepency
+  await client.sendMoney(10) // this call should not
+
+  console.log('done; disconnecting')
+
+  await client.disconnect()
+  await server.disconnect()
+  process.exit(0)
+}
+
+run()
+  .catch((e) => {
+    console.error(e)
+    process.exit(1)
+  })