# FAQ: Which data should I encode when building a webhook listener (HMAC authentication)?

**URL:** <https://connective.celigo.com/t/faq-which-data-should-i-encode-when-building-a-webhook-listener-hmac-authentication/1197>\
**Category:** Integrator.io\
**Tags:** authentication, security, listener, webhook\
**Created:** [March 13, 2021, 12:23am UTC](https://connective.celigo.com/t/faq-which-data-should-i-encode-when-building-a-webhook-listener-hmac-authentication/1197 "2021-03-13T00:23:36Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![kumarmouthiktumuluri](https://avatars.discourse-cdn.com/v4/letter/k/ba8739/32.png) [@kumarmouthiktumuluri](https://connective.celigo.com/u/kumarmouthiktumuluri)\
**Post date:** [March 13, 2024, 10:14am UTC](https://connective.celigo.com/t/faq-which-data-should-i-encode-when-building-a-webhook-listener-hmac-authentication/1197/2 "2024-03-13T10:14:28Z")

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can you give clear step by step procedure of screenshots i tried this article but im not getting the result as 401

[https://connective.celigo.com/t/construct-an-hmac-request-via-postman-to-send-test-requests-to-celigo-webhooks/1119](https://connective.celigo.com/t/construct-an-hmac-request-via-postman-to-send-test-requests-to-celigo-webhooks/1119)

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_[View the full topic](https://connective.celigo.com/t/faq-which-data-should-i-encode-when-building-a-webhook-listener-hmac-authentication/1197)._