Error when integrating API Gateway with Aws Lambda

Question

Hello,

I'm getting an error when integrating API Gateway with Aws Lambda, I make an Http REST POST call and I get the following JSON:
![Enter image description here](/media/postImages/original/IMYGH7sSs7S9K7JHYibzjOgA)

I debugged via CloudWatch but I can't find any reference to the reason for the error, my lamdba script receives a call from the gateway and makes a call to an external backend via HTTP REST POST. I haven't found the cause of this behavior yet.

![Enter image description here](/media/postImages/original/IM6VPKBL6sSDKP24unNM9r3w)

![Enter image description here](/media/postImages/original/IM6VGdV9smSdybOQCVd-wvlA)

Answer

Please check the following steps as mention in below

Step 1: Verify that the input format expected by the Lambda function matches the format of the data sent in the POST request.
Step2: Check the configuration of AWS API Gateway in the request and request mapping are configured correctly or not . 
Step 3: Check the payload of the POST request. A common cause for a 409 error is sending data that conflicts with the current state of the resource

Error when integrating API Gateway with Aws Lambda

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