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require 'sinatra'
require 'stripe'
require 'dotenv'
require 'json'
require 'encrypted_cookie'
$stdout.sync = true # Get puts to show up in heroku logs
Dotenv.load
Stripe.api_key = ENV['STRIPE_TEST_SECRET_KEY']
use Rack::Session::EncryptedCookie,
:secret => 'replace_me_with_a_real_secret_key' # Actually use something secret here!
def log_info(message)
puts "\n" + message + "\n\n"
return message
end
get '/' do
status 200
return log_info("Great, your backend is set up. Now you can configure the Stripe example apps to point here.")
end
post '/ephemeral_keys' do
authenticate!
begin
key = Stripe::EphemeralKey.create(
{customer: @customer.id},
{stripe_version: params["api_version"]}
)
rescue Stripe::StripeError => e
status 402
return log_info("Error creating ephemeral key: #{e.message}")
end
content_type :json
status 200
key.to_json
end
def authenticate!
# This code simulates "loading the Stripe customer for your current session".
# Your own logic will likely look very different.
return @customer if @customer
if session.has_key?(:customer_id)
customer_id = session[:customer_id]
begin
@customer = Stripe::Customer.retrieve(customer_id)
rescue Stripe::InvalidRequestError
end
else
default_cusomer_id = ENV['DEFAULT_CUSTOMER_ID']
if default_cusomer_id
@customer = Stripe::Customer.retrieve(default_cusomer_id)
else
begin
@customer = create_customer()
# Attach some test cards to the customer for testing convenience.
# See https://stripe.com/docs/payments/3d-secure#three-ds-cards
# and https://stripe.com/docs/mobile/android/authentication#testing
['4000000000003220', '4000000000003063', '4000000000003238', '4000000000003246', '4000000000003253', '4242424242424242'].each { |cc_number|
payment_method = Stripe::PaymentMethod.create({
type: 'card',
card: {
number: cc_number,
exp_month: 8,
exp_year: 2022,
cvc: '123',
},
})
Stripe::PaymentMethod.attach(
payment_method.id,
{
customer: @customer.id,
}
)
}
rescue Stripe::InvalidRequestError
end
end
session[:customer_id] = @customer.id
end
@customer
end
def create_customer
Stripe::Customer.create(
:description => 'mobile SDK example customer',
:metadata => {
# Add our application's customer id for this Customer, so it'll be easier to look up
:my_customer_id => '72F8C533-FCD5-47A6-A45B-3956CA8C792D',
},
)
end
# This endpoint responds to webhooks sent by Stripe. To use it, you'll need
# to add its URL (https://{your-app-name}.herokuapp.com/stripe-webhook)
# in the webhook settings section of the Dashboard.
# https://dashboard.stripe.com/account/webhooks
# See https://stripe.com/docs/webhooks
post '/stripe-webhook' do
# Retrieving the event from Stripe guarantees its authenticity
payload = request.body.read
event = nil
begin
event = Stripe::Event.construct_from(
JSON.parse(payload, symbolize_names: true)
)
rescue JSON::ParserError => e
# Invalid payload
status 400
return
end
# Handle the event
case event.type
when 'source.chargeable'
# For sources that require additional user action from your customer
# (e.g. authorizing the payment with their bank), you should use webhooks
# to capture a PaymentIntent after the source becomes chargeable.
# For more information, see https://stripe.com/docs/sources#best-practices
source = event.data.object # contains a Stripe::Source
WEBHOOK_CHARGE_CREATION_TYPES = ['bancontact', 'giropay', 'ideal', 'sofort', 'three_d_secure', 'wechat']
if WEBHOOK_CHARGE_CREATION_TYPES.include?(source.type)
begin
payment_intent = Stripe::PaymentIntent.create(
:amount => source.amount,
:currency => source.currency,
:source => source.id,
:payment_method_types => [source.type],
:description => "PaymentIntent for Source webhook",
:confirm => true,
:capture_method => ENV['CAPTURE_METHOD'] == "manual" ? "manual" : "automatic",
)
rescue Stripe::StripeError => e
status 400
return log_info("Webhook: Error creating PaymentIntent: #{e.message}")
end
return log_info("Webhook: Created PaymentIntent for source: #{payment_intent.id}")
end
when 'payment_intent.succeeded'
payment_intent = event.data.object # contains a Stripe::PaymentIntent
log_info("Webhook: PaymentIntent succeeded #{payment_intent.id}")
# Fulfill the customer's purchase, send an email, etc.
# When creating the PaymentIntent, consider storing any order
# information (e.g. order number) as metadata so that you can retrieve it
# here and use it to complete your customer's purchase.
when 'payment_intent.amount_capturable_updated'
# Capture the payment, then fulfill the customer's purchase like above.
payment_intent = event.data.object # contains a Stripe::PaymentIntent
log_info("Webhook: PaymentIntent succeeded #{payment_intent.id}")
else
# Unexpected event type
status 400
return
end
status 200
end
# ==== SetupIntent
# See https://stripe.com/docs/payments/cards/saving-cards-without-payment
# This endpoint is used by the mobile example apps to create a SetupIntent.
# https://stripe.com/docs/api/setup_intents/create
# A real implementation would include controls to prevent misuse
post '/create_setup_intent' do
payload = params
if request.content_type != nil and request.content_type.include? 'application/json' and params.empty?
payload = Sinatra::IndifferentHash[JSON.parse(request.body.read)]
end
begin
setup_intent = Stripe::SetupIntent.create({
payment_method: payload[:payment_method],
return_url: payload[:return_url],
confirm: payload[:payment_method] != nil,
customer: payload[:customer_id],
use_stripe_sdk: payload[:payment_method] != nil ? true : nil,
payment_method_types: ['card'],
})
rescue Stripe::StripeError => e
status 402
return log_info("Error creating SetupIntent: #{e.message}")
end
log_info("SetupIntent successfully created: #{setup_intent.id}")
status 200
return {
:intent => setup_intent.id,
:secret => setup_intent.client_secret,
:status => setup_intent.status
}.to_json
end
# ==== PaymentIntent Automatic Confirmation
# See https://stripe.com/docs/payments/payment-intents/ios
# This endpoint is used by the mobile example apps to create a PaymentIntent
# https://stripe.com/docs/api/payment_intents/create
# A real implementation would include controls to prevent misuse
post '/create_payment_intent' do
authenticate!
payload = params
if request.content_type != nil and request.content_type.include? 'application/json' and params.empty?
payload = Sinatra::IndifferentHash[JSON.parse(request.body.read)]
end
# Calculate how much to charge the customer
amount = calculate_price(payload[:products], payload[:shipping])
begin
payment_intent = Stripe::PaymentIntent.create(
:amount => amount,
:currency => currency_for_country(payload[:country]),
:customer => payload[:customer_id] || @customer.id,
:description => "Example PaymentIntent",
:capture_method => ENV['CAPTURE_METHOD'] == "manual" ? "manual" : "automatic",
payment_method_types: payment_methods_for_country(payload[:country]),
:metadata => {
:order_id => '5278735C-1F40-407D-933A-286E463E72D8',
}.merge(payload[:metadata] || {}),
)
rescue Stripe::StripeError => e
status 402
return log_info("Error creating PaymentIntent: #{e.message}")
end
log_info("PaymentIntent successfully created: #{payment_intent.id}")
status 200
return {
:intent => payment_intent.id,
:secret => payment_intent.client_secret,
:status => payment_intent.status
}.to_json
end
# ===== PaymentIntent Manual Confirmation
# See https://stripe.com/docs/payments/payment-intents/ios-manual
# This endpoint is used by the mobile example apps to create and confirm a PaymentIntent
# using manual confirmation.
# https://stripe.com/docs/api/payment_intents/create
# https://stripe.com/docs/api/payment_intents/confirm
# A real implementation would include controls to prevent misuse
post '/confirm_payment_intent' do
authenticate!
payload = params
if request.content_type.include? 'application/json' and params.empty?
payload = Sinatra::IndifferentHash[JSON.parse(request.body.read)]
end
begin
if payload[:payment_intent_id]
# Confirm the PaymentIntent
payment_intent = Stripe::PaymentIntent.confirm(payload[:payment_intent_id], {:use_stripe_sdk => true})
elsif payload[:payment_method_id]
# Calculate how much to charge the customer
amount = calculate_price(payload[:products], payload[:shipping])
# Create and confirm the PaymentIntent
payment_intent = Stripe::PaymentIntent.create(
:amount => amount,
:currency => currency_for_country(payload[:country]),
:customer => payload[:customer_id] || @customer.id,
:source => payload[:source],
:payment_method => payload[:payment_method_id],
:payment_method_types => payment_methods_for_country(payload[:country]),
:description => "Example PaymentIntent",
:shipping => payload[:shipping],
:return_url => payload[:return_url],
:confirm => true,
:confirmation_method => "manual",
# Set use_stripe_sdk for mobile apps using Stripe iOS SDK v16.0.0+ or Stripe Android SDK v10.0.0+
# Do not set this on apps using Stripe SDK versions below this.
:use_stripe_sdk => true,
:capture_method => ENV['CAPTURE_METHOD'] == "manual" ? "manual" : "automatic",
:metadata => {
:order_id => '5278735C-1F40-407D-933A-286E463E72D8',
}.merge(payload[:metadata] || {}),
)
else
status 400
return log_info("Error: Missing params. Pass payment_intent_id to confirm or payment_method to create")
end
rescue Stripe::StripeError => e
status 402
return log_info("Error: #{e.message}")
end
return generate_payment_response(payment_intent)
end
def generate_payment_response(payment_intent)
# Note that if your API version is before 2019-02-11, 'requires_action'
# appears as 'requires_source_action'.
if payment_intent.status == 'requires_action'
# Tell the client to handle the action
status 200
return {
requires_action: true,
secret: payment_intent.client_secret
}.to_json
elsif payment_intent.status == 'succeeded' or
(payment_intent.status == 'requires_capture' and ENV['CAPTURE_METHOD'] == "manual")
# The payment didn’t need any additional actions and is completed!
# Handle post-payment fulfillment
status 200
return {
:success => true
}.to_json
else
# Invalid status
status 500
return "Invalid PaymentIntent status"
end
end
# ===== Helpers
# Our example apps sell emoji apparel; this hash lets us calculate the total amount to charge.
EMOJI_STORE = {
"👕" => 2000,
"👖" => 4000,
"👗" => 3000,
"👞" => 700,
"👟" => 600,
"👠" => 1000,
"👡" => 2000,
"👢" => 2500,
"👒" => 800,
"👙" => 3000,
"💄" => 2000,
"🎩" => 5000,
"👛" => 5500,
"👜" => 6000,
"🕶" => 2000,
"👚" => 2500,
}
def calculate_price(products, shipping)
amount = 1099 # Default amount.
if products
amount = products.reduce(0) { | sum, product | sum + EMOJI_STORE[product] }
end
if shipping
case shipping
when "fedex"
amount = amount + 599
when "fedex_world"
amount = amount + 2099
when "ups_worldwide"
amount = amount + 1099
end
end
return amount
end
def currency_for_country(country)
# Determine currency to use. Generally a store would charge different prices for
# different countries, but for the sake of simplicity we'll charge X of the local currency.
case country
when 'us'
'usd'
when 'my'
'myr'
when 'nl'
'eur'
else
'usd'
end
end
def payment_methods_for_country(country)
case country
when 'us'
['card']
when 'my'
['card', 'fpx']
when 'nl'
['card', 'ideal', 'sepa_debit']
else
['card']
end
end
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