serverless_api_gateway_method.yml

Resources:
  ApiGatewayRootMethod:
    Type: AWS::ApiGateway::Method
    Properties:
      AuthorizationType: NONE
      HttpMethod: ANY
      Integration:
        IntegrationHttpMethod: POST
        Type: AWS_PROXY
        Uri: !Sub
          - arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${lambdaArn}/invocations
          - lambdaArn: !GetAtt LambdaFunction.Arn
      ResourceId: !GetAtt ApiGateway.RootResourceId
      RestApiId: !Ref ApiGateway