Now, let's create the API by using a CloudFormation template. We will not discuss the components that were already discussed in previous recipes, nor will we discuss the theory for commands that were already discussed within the CLI commands section. The complete code is available in the code files.

With the CloudFormation template, the major change is within the Integration property of the resource type AWS::ApiGateway::Method, as follows:

Integration:
  Type: AWS
  IntegrationHttpMethod: POST
  PassthroughBehavior: WHEN_NO_TEMPLATES
  RequestTemplates:
    application/json: "{ "name" : $input.json('$.user.name'), "time": $input.json('$.greeting.time') }"
  IntegrationResponses:
  - StatusCode: 200
    ResponseTemplates:
      application/json: "{ "greeting" : $input.json('$.message')}"
  Uri:
    !Sub
      - 'arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/arn:aws:lambda:us-east-1:${AWS::AccountId}:function:${LAMBDA_NAME}/invocations'
      - LAMBDA_NAME: !ImportValue LambdaForApiGateway