diff --git a/.github/workflows/rubygems_release.yml b/.github/workflows/rubygems_release.yml
new file mode 100644
index 00000000..e895053f
--- /dev/null
+++ b/.github/workflows/rubygems_release.yml
@@ -0,0 +1,19 @@
+name: Publish Gem
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v1
+
+      - name: Release Gem on RubyGems
+        if: contains(github.ref, 'refs/tags/v')
+        uses: cadwallion/publish-rubygems-action@master
+        env:
+          GITHUB_TOKEN: ${{secrets.TOKEN_RUBYGEMS_RELEASES_WITH_EXPIRATION}}
+          RUBYGEMS_API_KEY: ${{secrets.RUBYGEMS_API_KEY}}
diff --git a/lib/adyen/client.rb b/lib/adyen/client.rb
index e21e4a67..6396fea1 100644
--- a/lib/adyen/client.rb
+++ b/lib/adyen/client.rb
@@ -6,9 +6,9 @@
 module Adyen
   class Client
     attr_accessor :ws_user, :ws_password, :api_key, :client, :adapter, :live_url_prefix
-    attr_reader :env
+    attr_reader :env, :connection_options
 
-    def initialize(ws_user: nil, ws_password: nil, api_key: nil, env: :live, adapter: nil, mock_port: 3001, live_url_prefix: nil, mock_service_url_base: nil)
+    def initialize(ws_user: nil, ws_password: nil, api_key: nil, env: :live, adapter: nil, mock_port: 3001, live_url_prefix: nil, mock_service_url_base: nil, connection_options: nil)
       @ws_user = ws_user
       @ws_password = ws_password
       @api_key = api_key
@@ -16,6 +16,7 @@ def initialize(ws_user: nil, ws_password: nil, api_key: nil, env: :live, adapter
       @adapter = adapter || Faraday.default_adapter
       @mock_service_url_base = mock_service_url_base || "http://localhost:#{mock_port}"
       @live_url_prefix = live_url_prefix
+      @connection_options = connection_options || Faraday::ConnectionOptions.new
     end
 
     # make sure that env can only be :live, :test, or :mock
@@ -96,7 +97,7 @@ def call_adyen_api(service, action, request_data, headers, version, with_applica
       end
 
       # initialize Faraday connection object
-      conn = Faraday.new(url: url) do |faraday|
+      conn = Faraday.new(url, @connection_options) do |faraday|
         faraday.adapter @adapter
         faraday.headers["Content-Type"] = "application/json"
         faraday.headers["User-Agent"] = Adyen::NAME + "/" + Adyen::VERSION
diff --git a/lib/adyen/services/checkout.rb b/lib/adyen/services/checkout.rb
index 2218659d..0f6f4e65 100644
--- a/lib/adyen/services/checkout.rb
+++ b/lib/adyen/services/checkout.rb
@@ -71,6 +71,10 @@ def orders(*args)
     def apple_pay
       @apple_pay ||= Adyen::CheckoutApplePay.new(@client, @version)
     end
+
+    def modifications
+      @modifications ||= Adyen::Modifications.new(@client, @version)
+    end
   end
 
   class CheckoutDetail < Service
@@ -147,4 +151,42 @@ def sessions(request, headers = {})
       @client.call_adyen_api(@service, action, request, headers, @version)
     end
   end
+
+  class Modifications < Service
+    def initialize(client, version = DEFAULT_VERSION)
+      @service = "Checkout"
+      @client = client
+      @version = version
+    end
+
+    def capture(linkId, request, headers = {})
+      action = "payments/" + linkId + "/captures"
+      @client.call_adyen_api(@service, action, request, headers, @version, false)
+    end
+
+    def cancel(linkId, request, headers = {})
+      action = "payments/" + linkId + "/cancels"
+      @client.call_adyen_api(@service, action, request, headers, @version, false)
+    end
+
+    def genericCancel(request, headers = {})
+      action = "cancels"
+      @client.call_adyen_api(@service, action, request, headers, @version)
+    end
+  
+    def refund(linkId, request, headers = {})
+      action = "payments/" + linkId + "/refunds"
+      @client.call_adyen_api(@service, action, request, headers, @version, false)
+    end
+
+    def reversal(linkId, request, headers = {})
+      action = "payments/" + linkId + "/reversals"
+      @client.call_adyen_api(@service, action, request, headers, @version, false)
+    end
+
+    def amountUpdate(linkId, request, headers = {})
+      action = "payments/" + linkId + "/amountUpdates"
+      @client.call_adyen_api(@service, action, request, headers, @version, false)
+    end
+  end
 end
diff --git a/lib/adyen/version.rb b/lib/adyen/version.rb
index 50ca9537..d7e05b4a 100644
--- a/lib/adyen/version.rb
+++ b/lib/adyen/version.rb
@@ -1,4 +1,4 @@
 module Adyen
   NAME = "adyen-ruby-api-library"
-  VERSION = "6.1.0".freeze
+  VERSION = "6.2.0".freeze
 end
diff --git a/spec/checkout_spec.rb b/spec/checkout_spec.rb
index f974c9a6..412fd7b9 100644
--- a/spec/checkout_spec.rb
+++ b/spec/checkout_spec.rb
@@ -405,6 +405,198 @@
       to be_a_kind_of Hash
   end
 
+  it "makes a capture call" do
+    request_body = JSON.parse(json_from_file("mocks/requests/Checkout/capture.json"))
+  
+    response_body = json_from_file("mocks/responses/Checkout/capture.json")
+  
+    url = @shared_values[:client].service_url(@shared_values[:service], "payments/12345/captures", @shared_values[:client].checkout.version)
+    WebMock.stub_request(:post, url).
+      with(
+        body: request_body,
+        headers: {
+          "x-api-key" => @shared_values[:client].api_key
+        }
+      )
+      .to_return(body: response_body, status: 201)
+  
+    result = @shared_values[:client].checkout.modifications.capture("12345", request_body)
+    response_hash = result.response
+  
+    expect(result.status).
+      to eq(201)
+    expect(response_hash).
+      to eq(JSON.parse(response_body))
+    expect(response_hash).
+      to be_a Adyen::HashWithAccessors
+    expect(response_hash).
+      to be_a_kind_of Hash
+    expect(response_hash.reference).
+      to eq("123456789")
+    expect(response_hash.pspReference).
+      to eq("12345")
+  end
+
+  it "makes a psp specific cancel call" do
+    request_body = JSON.parse(json_from_file("mocks/requests/Checkout/psp_cancel.json"))
+  
+    response_body = json_from_file("mocks/responses/Checkout/psp_cancel.json")
+  
+    url = @shared_values[:client].service_url(@shared_values[:service], "payments/12345/cancels", @shared_values[:client].checkout.version)
+    WebMock.stub_request(:post, url).
+      with(
+        body: request_body,
+        headers: {
+          "x-api-key" => @shared_values[:client].api_key
+        }
+      )
+      .to_return(body: response_body, status: 201)
+  
+    result = @shared_values[:client].checkout.modifications.cancel("12345", request_body)
+    response_hash = result.response
+  
+    expect(result.status).
+      to eq(201)
+    expect(response_hash).
+      to eq(JSON.parse(response_body))
+    expect(response_hash).
+      to be_a Adyen::HashWithAccessors
+    expect(response_hash).
+      to be_a_kind_of Hash
+    expect(response_hash.reference).
+      to eq("123456789")
+    expect(response_hash.pspReference).
+      to eq("12345")
+  end
+
+  it "makes a psp specific refunds call" do
+    request_body = JSON.parse(json_from_file("mocks/requests/Checkout/refund.json"))
+  
+    response_body = json_from_file("mocks/responses/Checkout/refund.json")
+  
+    url = @shared_values[:client].service_url(@shared_values[:service], "payments/12345/refunds", @shared_values[:client].checkout.version)
+    WebMock.stub_request(:post, url).
+      with(
+        body: request_body,
+        headers: {
+          "x-api-key" => @shared_values[:client].api_key
+        }
+      )
+      .to_return(body: response_body, status: 201)
+  
+    result = @shared_values[:client].checkout.modifications.refund("12345", request_body)
+    response_hash = result.response
+  
+    expect(result.status).
+      to eq(201)
+    expect(response_hash).
+      to eq(JSON.parse(response_body))
+    expect(response_hash).
+      to be_a Adyen::HashWithAccessors
+    expect(response_hash).
+      to be_a_kind_of Hash
+    expect(response_hash.reference).
+      to eq("123456789")
+    expect(response_hash.pspReference).
+      to eq("12345")
+  end
+
+  it "makes a psp specific reversals call" do
+    request_body = JSON.parse(json_from_file("mocks/requests/Checkout/psp_cancel.json"))
+  
+    response_body = json_from_file("mocks/responses/Checkout/psp_cancel.json")
+  
+    url = @shared_values[:client].service_url(@shared_values[:service], "payments/12345/reversals", @shared_values[:client].checkout.version)
+    WebMock.stub_request(:post, url).
+      with(
+        body: request_body,
+        headers: {
+          "x-api-key" => @shared_values[:client].api_key
+        }
+      )
+      .to_return(body: response_body, status: 201)
+  
+    result = @shared_values[:client].checkout.modifications.reversal("12345", request_body)
+    response_hash = result.response
+  
+    expect(result.status).
+      to eq(201)
+    expect(response_hash).
+      to eq(JSON.parse(response_body))
+    expect(response_hash).
+      to be_a Adyen::HashWithAccessors
+    expect(response_hash).
+      to be_a_kind_of Hash
+    expect(response_hash.reference).
+      to eq("123456789")
+    expect(response_hash.pspReference).
+      to eq("12345")
+  end
+
+  it "makes a psp specific amountUpdates call" do
+    request_body = JSON.parse(json_from_file("mocks/requests/Checkout/amount_updates.json"))
+  
+    response_body = json_from_file("mocks/responses/Checkout/amount_updates.json")
+  
+    url = @shared_values[:client].service_url(@shared_values[:service], "payments/12345/amountUpdates", @shared_values[:client].checkout.version)
+    WebMock.stub_request(:post, url).
+      with(
+        body: request_body,
+        headers: {
+          "x-api-key" => @shared_values[:client].api_key
+        }
+      )
+      .to_return(body: response_body, status: 201)
+  
+    result = @shared_values[:client].checkout.modifications.amountUpdate("12345", request_body)
+    response_hash = result.response
+  
+    expect(result.status).
+      to eq(201)
+    expect(response_hash).
+      to eq(JSON.parse(response_body))
+    expect(response_hash).
+      to be_a Adyen::HashWithAccessors
+    expect(response_hash).
+      to be_a_kind_of Hash
+    expect(response_hash.reference).
+      to eq("123456789")
+    expect(response_hash.pspReference).
+      to eq("12345")
+  end
+
+  it "makes a generic cancel call" do
+    request_body = JSON.parse(json_from_file("mocks/requests/Checkout/generic_cancel.json"))
+  
+    response_body = json_from_file("mocks/responses/Checkout/generic_cancel.json")
+  
+    url = @shared_values[:client].service_url(@shared_values[:service], "cancels", @shared_values[:client].checkout.version)
+    WebMock.stub_request(:post, url).
+      with(
+        body: request_body,
+        headers: {
+          "x-api-key" => @shared_values[:client].api_key
+        }
+      )
+      .to_return(body: response_body, status: 201)
+  
+    result = @shared_values[:client].checkout.modifications.genericCancel(request_body)
+    response_hash = result.response
+  
+    expect(result.status).
+      to eq(201)
+    expect(response_hash).
+      to eq(JSON.parse(response_body))
+    expect(response_hash).
+      to be_a Adyen::HashWithAccessors
+    expect(response_hash).
+      to be_a_kind_of Hash
+    expect(response_hash.reference).
+      to eq("123456789")
+    expect(response_hash.pspReference).
+      to eq("12345")
+  end
+
   # create client for automated tests
   client = create_client(:api_key)
 
diff --git a/spec/client_spec.rb b/spec/client_spec.rb
index 4d074bdd..e2c72349 100644
--- a/spec/client_spec.rb
+++ b/spec/client_spec.rb
@@ -83,4 +83,31 @@
     expect(client.service_url_base("Payment")).
       to eq("https://abcdef1234567890-TestCompany-pal-live.adyenpayments.com/pal/servlet")
   end
+
+  it "generates a new set of ConnectionOptions when none are provided" do
+    expect(Faraday::ConnectionOptions).to receive(:new).and_call_original
+    client = Adyen::Client.new(env: :test)
+  end
+
+  it "uses the ConnectionOptions provided" do
+    connection_options = Faraday::ConnectionOptions.new
+    expect(Faraday::ConnectionOptions).not_to receive(:new)
+    client = Adyen::Client.new(env: :test, connection_options: connection_options)
+  end
+
+  it "initiates a Faraday connection with the provided options" do
+    connection_options = Faraday::ConnectionOptions.new
+    expect(Faraday::ConnectionOptions).not_to receive(:new)
+    client = Adyen::Client.new(api_key: "api_key", env: :mock, connection_options: connection_options)
+
+    mock_faraday_connection = double(Faraday::Connection)
+    url = client.service_url(@shared_values[:service], "payments/details", client.checkout.version)
+    request_body = JSON.parse(json_from_file("mocks/requests/Checkout/payment-details.json"))
+    mock_response = Faraday::Response.new(status: 200)
+
+    expect(Adyen::AdyenResult).to receive(:new)
+    expect(Faraday).to receive(:new).with("http://localhost:3001/v68/payments/details", connection_options).and_return(mock_faraday_connection)
+    expect(mock_faraday_connection).to receive(:post).and_return(mock_response)
+    client.checkout.payments.details(request_body)
+  end
 end
diff --git a/spec/mocks/requests/Checkout/amount_updates.json b/spec/mocks/requests/Checkout/amount_updates.json
new file mode 100644
index 00000000..d04a96cd
--- /dev/null
+++ b/spec/mocks/requests/Checkout/amount_updates.json
@@ -0,0 +1,22 @@
+{
+    "amount": {
+      "currency": "str",
+      "value": 0
+    },
+    "merchantAccount": "TestMerchant",
+    "reason": "delayedCharge",
+    "reference": "123456789",
+    "splits": [
+      {
+        "account": "string",
+        "amount": {
+          "currency": "str",
+          "value": 0
+        },
+        "description": "string",
+        "reference": "string",
+        "type": "BalanceAccount"
+      }
+    ]
+}
+  
\ No newline at end of file
diff --git a/spec/mocks/requests/Checkout/capture.json b/spec/mocks/requests/Checkout/capture.json
new file mode 100644
index 00000000..0ffbfe1a
--- /dev/null
+++ b/spec/mocks/requests/Checkout/capture.json
@@ -0,0 +1,34 @@
+{
+    "amount": {
+      "currency": "str",
+      "value": 0
+    },
+    "lineItems": [
+      {
+        "amountExcludingTax": 0,
+        "amountIncludingTax": 0,
+        "description": "string",
+        "id": "string",
+        "imageUrl": "string",
+        "itemCategory": "string",
+        "productUrl": "string",
+        "quantity": 0,
+        "taxAmount": 0,
+        "taxPercentage": 0
+      }
+    ],
+    "merchantAccount": "string",
+    "reference": "string",
+    "splits": [
+      {
+        "account": "string",
+        "amount": {
+          "currency": "str",
+          "value": 0
+        },
+        "description": "string",
+        "reference": "string",
+        "type": "BalanceAccount"
+      }
+    ]
+}
\ No newline at end of file
diff --git a/spec/mocks/requests/Checkout/generic_cancel.json b/spec/mocks/requests/Checkout/generic_cancel.json
new file mode 100644
index 00000000..2f5fdad7
--- /dev/null
+++ b/spec/mocks/requests/Checkout/generic_cancel.json
@@ -0,0 +1,5 @@
+{
+    "merchantAccount": "TestMerchant",
+    "paymentReference": "12345",
+    "reference": "123456789"
+}
\ No newline at end of file
diff --git a/spec/mocks/requests/Checkout/modifications_request.json b/spec/mocks/requests/Checkout/modifications_request.json
new file mode 100644
index 00000000..e69de29b
diff --git a/spec/mocks/requests/Checkout/psp_cancel.json b/spec/mocks/requests/Checkout/psp_cancel.json
new file mode 100644
index 00000000..6459c3c8
--- /dev/null
+++ b/spec/mocks/requests/Checkout/psp_cancel.json
@@ -0,0 +1,4 @@
+{
+    "merchantAccount": "TestMerchant",
+    "reference": "123456789"
+}
\ No newline at end of file
diff --git a/spec/mocks/requests/Checkout/refund.json b/spec/mocks/requests/Checkout/refund.json
new file mode 100644
index 00000000..9a030960
--- /dev/null
+++ b/spec/mocks/requests/Checkout/refund.json
@@ -0,0 +1,34 @@
+{
+    "amount": {
+      "currency": "str",
+      "value": 0
+    },
+    "lineItems": [
+      {
+        "amountExcludingTax": 0,
+        "amountIncludingTax": 0,
+        "description": "string",
+        "id": "string",
+        "imageUrl": "string",
+        "itemCategory": "string",
+        "productUrl": "string",
+        "quantity": 0,
+        "taxAmount": 0,
+        "taxPercentage": 0
+      }
+    ],
+    "merchantAccount": "TestMerchant",
+    "reference": "123456789",
+    "splits": [
+      {
+        "account": "string",
+        "amount": {
+          "currency": "str",
+          "value": 0
+        },
+        "description": "string",
+        "reference": "string",
+        "type": "BalanceAccount"
+      }
+    ]
+}
\ No newline at end of file
diff --git a/spec/mocks/responses/Checkout/amount_updates.json b/spec/mocks/responses/Checkout/amount_updates.json
new file mode 100644
index 00000000..c532a14a
--- /dev/null
+++ b/spec/mocks/responses/Checkout/amount_updates.json
@@ -0,0 +1,24 @@
+{
+    "amount": {
+      "currency": "str",
+      "value": 0
+    },
+    "merchantAccount": "TestMerchant",
+    "paymentPspReference": "123456789",
+    "pspReference": "12345",
+    "reason": "delayedCharge",
+    "reference": "123456789",
+    "splits": [
+      {
+        "account": "string",
+        "amount": {
+          "currency": "str",
+          "value": 0
+        },
+        "description": "string",
+        "reference": "string",
+        "type": "BalanceAccount"
+      }
+    ],
+    "status": "received"
+}
\ No newline at end of file
diff --git a/spec/mocks/responses/Checkout/capture.json b/spec/mocks/responses/Checkout/capture.json
new file mode 100644
index 00000000..f874e722
--- /dev/null
+++ b/spec/mocks/responses/Checkout/capture.json
@@ -0,0 +1,37 @@
+{
+    "amount": {
+      "currency": "str",
+      "value": 0
+    },
+    "lineItems": [
+      {
+        "amountExcludingTax": 0,
+        "amountIncludingTax": 0,
+        "description": "string",
+        "id": "string",
+        "imageUrl": "string",
+        "itemCategory": "string",
+        "productUrl": "string",
+        "quantity": 0,
+        "taxAmount": 0,
+        "taxPercentage": 0
+      }
+    ],
+    "merchantAccount": "string",
+    "paymentPspReference": "string",
+    "pspReference": "12345",
+    "reference": "123456789",
+    "splits": [
+      {
+        "account": "string",
+        "amount": {
+          "currency": "str",
+          "value": 0
+        },
+        "description": "string",
+        "reference": "string",
+        "type": "BalanceAccount"
+      }
+    ],
+    "status": "received"
+}
\ No newline at end of file
diff --git a/spec/mocks/responses/Checkout/generic_cancel.json b/spec/mocks/responses/Checkout/generic_cancel.json
new file mode 100644
index 00000000..2b62c1e5
--- /dev/null
+++ b/spec/mocks/responses/Checkout/generic_cancel.json
@@ -0,0 +1,7 @@
+{
+    "merchantAccount": "string",
+    "paymentReference": "123456789",
+    "pspReference": "12345",
+    "reference": "123456789",
+    "status": "received"
+}
\ No newline at end of file
diff --git a/spec/mocks/responses/Checkout/modifications.json b/spec/mocks/responses/Checkout/modifications.json
new file mode 100644
index 00000000..e69de29b
diff --git a/spec/mocks/responses/Checkout/psp_cancel.json b/spec/mocks/responses/Checkout/psp_cancel.json
new file mode 100644
index 00000000..18789077
--- /dev/null
+++ b/spec/mocks/responses/Checkout/psp_cancel.json
@@ -0,0 +1,7 @@
+{
+    "merchantAccount": "TestMerchant",
+    "paymentPspReference": "string",
+    "pspReference": "12345",
+    "reference": "123456789",
+    "status": "received"
+}
\ No newline at end of file
diff --git a/spec/mocks/responses/Checkout/refund.json b/spec/mocks/responses/Checkout/refund.json
new file mode 100644
index 00000000..416f0b4d
--- /dev/null
+++ b/spec/mocks/responses/Checkout/refund.json
@@ -0,0 +1,37 @@
+{
+    "amount": {
+      "currency": "str",
+      "value": 0
+    },
+    "lineItems": [
+      {
+        "amountExcludingTax": 0,
+        "amountIncludingTax": 0,
+        "description": "string",
+        "id": "string",
+        "imageUrl": "string",
+        "itemCategory": "string",
+        "productUrl": "string",
+        "quantity": 0,
+        "taxAmount": 0,
+        "taxPercentage": 0
+      }
+    ],
+    "merchantAccount": "TestMerchant",
+    "paymentPspReference": "123456789",
+    "pspReference": "12345",
+    "reference": "123456789",
+    "splits": [
+      {
+        "account": "string",
+        "amount": {
+          "currency": "str",
+          "value": 0
+        },
+        "description": "string",
+        "reference": "string",
+        "type": "BalanceAccount"
+      }
+    ],
+    "status": "received"
+}
\ No newline at end of file