Google Play authentication (gps)

Setup checklist

1. Create a Google Cloud service account.
2. Enable Google Play Android Developer API.
3. Invite the SA email in Play Console → Users and permissions with the needed app roles.
4. Download the JSON key. Never commit it.

Credential precedence

1. --credentials <path|json>
2. GPS_CREDENTIALS / GOOGLE_PLAY_CREDENTIALS
3. GOOGLE_APPLICATION_CREDENTIALS
4. ~/.config/gps/config.json → { "credentialsPath": "..." }