- For more information on the intrinsic function Fn::ImportValue, you can refer to https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/intrinsic-function-reference-importvalue.html
- For more information on AWS::Lambda::Permission, you can refer to https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-lambda-permission.html.