cognito client_credential flow using lambda triggers

Question

Good morning I have the following scenario protecting the cognito client_credential flow with additional programmatic control using cognito lambda triggers.
After a bit of testing and reading the documentation I saw that the lambda triggers are only valid for user-type flow access and not for the client_credential flow. There is a way to add on cognito or with an external AWS service (like WAF ACL) to limit a maximum of 24 tokens per day for a single clientId always flow client_credential.
Thanks in advance

Answer

Currently, no lambda trigger would be fired during client_credential flow. 
So, you might build one own backend REST API to relay the client credential flow request and control the access there. 
one own backend REST API - could be implemented by APIGateway+lambda serverless or a EC2 or any other possible REST API framework you like.

cognito client_credential flow using lambda triggers

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