# Unable to validate sigv4 signature

**URL:** <https://community.postman.com/t/unable-to-validate-sigv4-signature/44852>\
**Category:** Help Hub\
**Tags:** authentication\
**Created:** [March 7, 2023, 5:35pm UTC](https://community.postman.com/t/unable-to-validate-sigv4-signature/44852 "2023-03-07T17:35:37Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![spaceflight-geosci12](https://avatars.discourse-cdn.com/v4/letter/s/958977/32.png) [@spaceflight-geosci12](https://community.postman.com/u/spaceflight-geosci12)\
**Post date:** [March 7, 2023, 5:35pm UTC](https://community.postman.com/t/unable-to-validate-sigv4-signature/44852/1 "2023-03-07T17:35:37Z")

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_My question_:  
I am trying to integrate with sigv4 and I am able to successfully validate with a GET request, but I am unable to successfully validate with a POST request. My assumption is that the request body hash is calculated differently between postman and my application. I would like to be able to debug through the postman code to be able to see how the signature is created. Is there anyway to do this?

_I’ve already tried_:  
I have a test created application side based on the Postman data sent to the app, but without more context of how the signature is created on Postmans side its not very helpful.