AWS API Gateway Mapping Template to Execute Step Function

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I am looking for someone that can provide me the API Gateway Mapping Template on the first try, not someone giving me several attempts to try and make it work. I have an API gateway with 2 stages: "prod" and "stage". When someone makes a POST, I have a mapping template with the following json key/values which work fine. "stateMachineArn": "STEP_FUNCTION_ARN:$stageVariables.lambdaAlias", "input": "$util.escapeJavaScript($input.json('$'))" However, I need to be able to append the stageVariables.lambdaAlias into incoming payload as a key/value. My payload sent is nested json with the following keys: "campaign" - nested json with several keys "mailer" - nested json with several keys "round" - static value I'm simply trying to add "lambdaAlias": $stageVariables.lambdaAlias as an additional key/value to that input and then have it all sent all in the "input" because I really don't want to change my step function.

Keyword: JavaScript

Price: $25.0

Amazon Web Services Amazon API Gateway