old_contents: from __future__ import absolute_import, division, print_function
  
  import stripe
  
  
  TEST_RESOURCE_ID = "loc_123"
  
  
  class TestSession(object):
      def test_is_creatable(self, request_mock):
          resource = stripe.checkout.Session.create(
              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": "test@stripe.com"},
              payment_method_types=["card"],
              success_url="https://stripe.com/success",
          )
          request_mock.assert_requested("post", "/v1/checkout/sessions")
          assert isinstance(resource, stripe.checkout.Session)
  
new_contents: from __future__ import absolute_import, division, print_function
  
  import stripe
  
  
  TEST_RESOURCE_ID = "cs_123"
  
  
  class TestSession(object):
      def test_is_creatable(self, request_mock):
          resource = stripe.checkout.Session.create(
              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": "test@stripe.com"},
              payment_method_types=["card"],
              success_url="https://stripe.com/success",
          )
          request_mock.assert_requested("post", "/v1/checkout/sessions")
          assert isinstance(resource, stripe.checkout.Session)
  
      def test_is_retrievable(self, request_mock):
          resource = stripe.checkout.Session.retrieve(TEST_RESOURCE_ID)
          request_mock.assert_requested(
              "get", "/v1/checkout/sessions/%s" % TEST_RESOURCE_ID
          )
          assert isinstance(resource, stripe.checkout.Session)
  
subject: Add support for retrieving a Checkout Session