Get Your Verification Credentials from the Google Play Console

1. Navigate to the Google Cloud console⁠.

2. If you don't have an existing project that you would like to use, create a new project. Otherwise, select an existing project.

3. From the sidebar on the left, select the tab titled IAM & Admin.

4. Now, from the sidebar select the tab titled Service Accounts and click the button Create Service Account.

5. Enter your Service account name and click Create and Continue.

6. Grant the newer service account basic viewer access.

7. After clicking Done, click on the service account that you just created, and navigate to the tab titled Keys.

8. Create a new JSON private key. This will save the credential to your local machine to be used later.

9. Now, under the Details tab, copy the email address associated with the new service account.

10. Navigate to the Google Play console⁠, and under the Users and permissions tab, click Invite new users.

11. Paste the service account email address and under the Account permissions tab, select the View app information, View financial data, and Manage orders and subscriptions permissions.

12. Save your changes.

13. Now, return to the Google Cloud Console⁠, and visit the APIs dashboard.

14. Click Enable APIs and Services, search for the Google Play Android Developer API, and enable it.

You are now ready to upload the manually-downloaded JSON file to Facebook.