I did this for a client using APIGW and DynamoDB. The claim check is the key, and then there’s a polling endpoint in APIGW that goes directly to DynamoDB with

I did this for a client using APIGW and DynamoDB. The claim check is the key, and then there’s a polling endpoint in APIGW that goes directly to DynamoDB with no Lambda in between. When the claim check is processed, the location of the data is an additional attribute in DynamoDB and the APIGW/DynamoDB integration sends an HTTP 302 with the final result URL.