Cognito user pool authorizer definition in Serverless Framework

serverless.yml

functions:
  myfunc:
    handler: bin/myhandler
    events:
      - http:
          path: myapipath
          method: get
          authorizer:
            type: COGNITO_USER_POOLS
            authorizerId:
              Ref: MyAppAPIAuthorizer
              
resources:
  Resources:
    MyAppAPIAuthorizer:
    Type: AWS::ApiGateway::Authorizer
    Properties:
      AuthorizerResultTtlInSeconds: 300
      AuthType: String
      IdentitySource: method.request.header.Authorization
      Name: MyAppAPIAuthorizer
      ProviderARNs:
        - Fn::GetAtt: [MyUserPool, Arn]
      RestApiId:
        Ref: ApiGatewayRestApi
      Type: COGNITO_USER_POOLS