# Error:invalid\_client

**URL:** <https://devforum.zoom.us/t/error-invalid-client/39100>\
**Category:** API and Webhooks\
**Created:** [December 23, 2020, 7:05pm UTC](https://devforum.zoom.us/t/error-invalid-client/39100 "2020-12-23T19:05:49Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![will.zoom](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/will.zoom/32/14417_2.png) [@will.zoom](https://devforum.zoom.us/u/will.zoom)\
**Post date:** [December 28, 2020, 6:00pm UTC](https://devforum.zoom.us/t/error-invalid-client/39100/2 "2020-12-28T18:00:12Z")

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Hi @mark.krawec,

Thanks for reaching out about this, and happy to help.

It sounds like you’ve already seen our guide for retrieving an access token, right?  
[https://marketplace.zoom.us/docs/guides/auth/oauth](https://marketplace.zoom.us/docs/guides/auth/oauth)

If you’re still having trouble, a few things to double check:

- You’ve successfully created an OAuth App to generate a Client ID and Client Secret
- You’re grabbing the `code` parameter from the redirect URL after hitting the user installation URL (install button, testable URL)
- You’re including the required Authorization header in your request

Once you’ve double checked these things, I also recommend checking out this thread:

> [@"Invalid client\_id or client\_secret"](https://devforum.zoom.us/t/invalid-client-id-or-client-secret/5252/4):
>
> Hey @abhilash, Did you include the required [Authorization header](https://marketplace.zoom.us/docs/guides/authorization/oauth/oauth-with-zoom#request-access-token) in your request? "Authorization": "Basic base64Encode(Client\_Id:Client\_Secret)" ([You can base64encode them here.](https://www.base64encode.org/) Make sure to include the : in between your client\_id and client\_secret) It will look something like this "Authorization": "Basic YXNkZmFzZGZha3M6YWRramZiYXNrbGRqZmFzZGY=" Also, you need to change redirection\_uri to redirect\_uri. Let me know if this works! Thanks, Tommy

Please let me know if this helps!

Best,  
Will  
\*

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