Add support for Checkout Sessions

.travis.yml

@@ -17,7 +17,7 @@ sudo: false
 env:
   global:
     # If changing this number, please also change it in `test/test_helper.rb`.
-    - STRIPE_MOCK_VERSION=0.39.0
+    - STRIPE_MOCK_VERSION=0.40.0
 
 cache:
   directories:

lib/stripe.rb

@@ -49,6 +49,7 @@
 require "stripe/bitcoin_transaction"
 require "stripe/card"
 require "stripe/charge"
+require "stripe/checkout_session"
 require "stripe/country_spec"
 require "stripe/coupon"
 require "stripe/customer"

lib/stripe/checkout_session.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+module Stripe
+  class CheckoutSession < APIResource
+    extend Stripe::APIOperations::Create
+
+    OBJECT_NAME = "checkout_session".freeze
+  end
+end

lib/stripe/util.rb

@@ -58,6 +58,7 @@ def self.object_classes # rubocop:disable Metrics/MethodLength
         BitcoinTransaction::OBJECT_NAME        => BitcoinTransaction,
         Card::OBJECT_NAME                      => Card,
         Charge::OBJECT_NAME                    => Charge,
+        CheckoutSession::OBJECT_NAME           => CheckoutSession,
         CountrySpec::OBJECT_NAME               => CountrySpec,
         Coupon::OBJECT_NAME                    => Coupon,
         Customer::OBJECT_NAME                  => Customer,

test/stripe/checkout_session_test.rb

@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+require ::File.expand_path("../../test_helper", __FILE__)
+
+module Stripe
+  class CheckoutSessionTest < Test::Unit::TestCase
+    should "be creatable" do
+      session = Stripe::CheckoutSession.create(
+        allowed_source_types: ["card"],
+        cancel_url: "https://stripe.com/cancel",
+        client_reference_id: "1234",
+        line_items: [
+          {
+            amount: 123,
+            currency: "usd",
+            description: "item 1",
+            images: [
+              "https://stripe.com/img1",
+            ],
+            name: "name",
+            quantity: 2,
+          },
+        ],
+        payment_intent_data: [
+          receipt_email: "[email protected]",
+        ],
+        success_url: "https://stripe.com/success"
+      )
+      assert_requested :post, "#{Stripe.api_base}/v1/checkout_sessions"
+      assert session.is_a?(Stripe::CheckoutSession)
+    end
+  end
+end

test/test_helper.rb

@@ -16,7 +16,7 @@
 require ::File.expand_path("../test_data", __FILE__)
 
 # If changing this number, please also change it in `.travis.yml`.
-MOCK_MINIMUM_VERSION = "0.39.0".freeze
+MOCK_MINIMUM_VERSION = "0.40.0".freeze
 MOCK_PORT = ENV["STRIPE_MOCK_PORT"] || 12_111
 
 # Disable all real network connections except those that are outgoing to