Google Play Developer API - “The current user has insufficient permissions to perform the requested operation.”

Question

I have a Google dev console process with Google Play Developer API is enabled and the project is linked to Google Play project. In Google Dev console project, created OAuth

Answer 1

There is a very important thing about receipt validation using Google Play Android Developer API.

If you added your in-app product BEFORE granting permission or linking to your service account, you need to open "In-app products" and perform some update. You can for example edit description of your product and save. You should instantly get permission.