How do I set a redirect URL for the PayPal Identity API?

Here's how: 

1. After logging in to your PayPal Developer account, go to the Apps & Credentials page. 
2. Toggle to Live or Sandbox, depending on which environment you're working in. 
3. In the REST API apps section, select the app you're working with.
4. In the app settings section, click Show under Return URL. 

All parts of the specified redirect_uri, including the protocol, host, port, and context path, must match your registered return URL.

Redirect_uri failure occurs due to an inconsistency between the account and code. If you make any changes, be sure to apply the same updates in your account and code. It may take a few hours for values to update.