Fix OAuth & ChatGPT Image API

I’m stuck with an authentication failure every time my app tries to sign users in through Google’s OAuth 2.0 flow. The consent screen appears, but the callback never returns a valid token, so the session stalls. I need an experienced developer to locate the mis-configuration—whether it’s the redirect URI, client credentials, scope handling, or code logic—and get a clean, repeatable login working.

In parallel, my ChatGPT image API integration has started throwing errors instead of the expected response. I’ll share logs and request samples once we connect; your job is to diagnose the root cause, adjust the request structure or headers if necessary, and restore reliable image generation.

Deliverables
• Google OAuth 2.0 flow completes successfully and issues usable access/refresh tokens
• ChatGPT image API calls return valid image data without errors
• Short change log or README outlining fixes, so I can maintain the solution

If you’re confident with Google Cloud Console, OAuth scopes, JWT handling, and OpenAI endpoints, I’m ready to start right away.