This article assumes you already have a working integration between AWS API Gateway and Amazon EventBridge.

It seems like you’re really trying to avoid using another lambda to handle the payload transformation. Good choice*. The number of lambdas in a serverless infrastructure can quickly get out-of-hand and you should avoid creating unnecessary resources whenever it’s possible.

Amazon REST API Gateway offers a solution in the form of Mapping templates. The basic passthrough integration looks as follows:

  • DetailType: Identifies, in combination with the Source

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