# Adding webhook subscription failing

**URL:** <https://community.servicem8.com/t/adding-webhook-subscription-failing/113>\
**Category:** API & SDK\
**Created:** [August 19, 2025, 12:08pm UTC](https://community.servicem8.com/t/adding-webhook-subscription-failing/113 "2025-08-19T12:08:55Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![developer](https://avatars.discourse-cdn.com/v4/letter/d/bcef8e/32.png) [@developer](https://community.servicem8.com/u/developer)\
**Post date:** [August 19, 2025, 12:08pm UTC](https://community.servicem8.com/t/adding-webhook-subscription-failing/113/1 "2025-08-19T12:08:55Z")

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**Originally posted by Nicholas Lornie**

Hi,

I’m trying to set up a test webhook subscription for the job object and the work\_done\_description field, I’m passing these through in x-www-form-urlencoded format along with a callback\_url of [https://f3aa594a-6a2e-4a69-a7ed-f1bcbe4ce60c.mock.pstmn.io/servicem8callback](https://f3aa594a-6a2e-4a69-a7ed-f1bcbe4ce60c.mock.pstmn.io/servicem8callback) which should be returning the challenge token.

I’m sending the POST request to [https://api.servicem8.com/webhook\_subscriptions/object](https://api.servicem8.com/webhook_subscriptions/object) with an x-api-key header, but I get a success:false response back with no messages, is there anything i can try to see what’s wrong with the request?

Thanks,

Nick