How to register a Stack App with explicit OAuth 2.0 flow to a third party site?

Question

I am about to integrate a Stack Overflow app to a third party website / integration service (Zoho).

The third party website's documentation mentioned that the redirect URL is https://deluge.zoho.com/delugeauth/callback.
I gave this URL as the OAuth Domain during stack app registration.

And I did not not enable Client Side OAuth Flow and I enabled Desktop OAuth Redirect Uri.

After I had given all the credentials (Client id,Secret,Authorize url,access token url), I'm getting this message:

redirect_uri is not under the registered domain for this application

Please do help me connect the Stack Exchange API to the third party site.

Answer 1

Note that a URI is not a domain, but this seems to be a common mistake when setting up OAuth2.

Also reference:

• `redirect_uri` is not under the registered domain for this application
• What exactly is a valid OAuth domain name for registering your app?
• Can the redirect_uri contain port number? This answer has detailed instructions on how to set-up and use explicit OAuth with the Stack Exchange API.

So, apparently, on your Stack Apps configuration page you would set OAuth Domain to zoho.com (not deluge.zoho.com, and not to a URL).

Also: Disable Desktop OAuth Redirect Uri in this case.