# Invalid Grant Type for Oauth app using PHP

**URL:** <https://devforum.zoom.us/t/invalid-grant-type-for-oauth-app-using-php/87191>\
**Category:** Authentication\
**Created:** [April 21, 2023, 8:20pm UTC](https://devforum.zoom.us/t/invalid-grant-type-for-oauth-app-using-php/87191 "2023-04-21T20:20:11Z")\
**Posts on this page:** 1\
**Showing post:** 7

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**Author:** ![elisa.zoom](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/elisa.zoom/32/47836_2.png) [@elisa.zoom](https://devforum.zoom.us/u/elisa.zoom)\
**Post date:** [May 1, 2023, 5:28pm UTC](https://devforum.zoom.us/t/invalid-grant-type-for-oauth-app-using-php/87191/7 "2023-05-01T17:28:03Z")

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Thanks @alanj  
Here is a very helpful post on how to use Oauth with postman:

> [@Guide: Making a Zoom API Call with OAuth Credentials in Postman](https://devforum.zoom.us/t/guide-making-a-zoom-api-call-with-oauth-credentials-in-postman/64538):
>
> To publish an app on the Zoom Marketplace you must create an [OAuth app](https://marketplace.zoom.us/docs/guides/build/oauth-app/). When you’re ready to test making API calls, download the latest version of Postman and import the Zoom API collections following the steps outlined [here](https://marketplace.zoom.us/docs/guides/guides/postman/using-postman-to-test-zoom-apis/). There are Three Ways to Set up OAuth in Postman to Make API Requests We’re going to go through three ways to set up our OAuth application credentials to successfully authorize and access the Zoom API to make requests. The “Easy” Difficulty OAuth 2.0 Set Up in Postman We’…

If you can follow along, you might be able to identify the issue

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