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Hi,
Does you select the "Lambda proxy integration" in API Gateway "Integration request"?
In Lambda proxy integration, API Gateway maps the entire client request to the input event parameter of the backend Lambda function[1] .
If you don't set the "Lambda proxy integration"[2], the API gateway will use custom integrations and you need to set the "mapping template"[3].
The "mapping template" will determine which parameter could send to the lambda.
[1] https://docs.aws.amazon.com/apigateway/latest/developerguide/set-up-lambda-proxy-integrations.html#api-gateway-simple-proxy-for-lambda-input-format
[2]https://docs.aws.amazon.com/apigateway/latest/developerguide/set-up-lambda-custom-integrations.html
[3]https://docs.aws.amazon.com/apigateway/latest/developerguide/models-mappings.html