GitHub app fails after deploying to production

So I have this github app, which manages to update file content and create new files when I use it on my localhost. But as soon as I deploy the app to production, it fails and gives an error saying 403 forbidden "Resource not accessible by integration". Any help on this topic will be hugely appreciated. I have been blocked for a week now and this frustrating.

Update: Managed to get it up and running. Needed a Personal Access Token to be genarated and passed on to the Authorization Header while making the service call.

https://stackoverflow.com/questions/63638496/any-idea-why-my-github-app-manages-to-update-the-file-content-using-the-same-ser