Hello! I’m trying to integrate the Google Drive API into my PHP application, but I’m facing an issue during the authentication phase. I’ve followed the official guide for the setup, yet every time I attempt to authenticate, I encounter an error stating: ‘apiAuthException’ with the message ‘Error fetching OAuth2 access token, message: redirect_uri_mismatch’.
I’ve reviewed my configuration several times, but I’m unable to identify the problem. It appears to be related to the redirect URI, but I’m not clear on what needs adjustment. Has anyone else experienced this issue? What aspects should I check in my Google Cloud Console configuration or my PHP code to resolve this authentication error?
I would greatly appreciate any assistance, as I’m currently stuck on this step and unable to move forward with my project.
yup, I got stuck on this too! It’s crucial that the redirect uri in the Google Console matches exactly with what you have in your PHP. Even a simple slash can mess it up. And don’t forget to check if you’re using http or https; that’s super easy to overlook!
This redirect_uri_mismatch error occurs when the URI set in your Google Cloud Console does not exactly match what your PHP application is sending during the OAuth process. Start by ensuring that the URLs align correctly, including factors like whether you’re using localhost or a live domain as authorized redirect URIs for testing. It’s easy to overlook small details like a trailing slash or differing query parameters in your PHP code compared to what’s registered. Reviewing the error logs on the Google Cloud Console can also provide clarity on what URI was received versus what was expected, which is invaluable for debugging.
I hit this same redirect_uri_mismatch error about six months ago on a client project. The fix was trickier than just matching URLs. My problem was I’d set up the redirect URI in Google Cloud Console but was testing locally on a different port. Make sure your redirect URI includes the exact port your local server’s running on. Google’s super strict about the redirect URI format too - your PHP code has to send the exact same URI during OAuth as what’s registered in the console. Also check that your client credentials file matches your current project settings. I’ve seen devs accidentally use credentials from the wrong project or environment.