Configure shared secret
Configure the shared secret of your app in order to allow IAPHUB validating your renewable subscriptions.
1. Go to the App Store Connect, click on "My Apps" and select your app.
If you do not have an app on App Store Connect, you should create one.
2. Go to App Store > App Information > App-Specific Shared Secret and click on "Manage"
3. Click on the 'Generate' button
If you've already generated a shared secret, this button will not be displayed and it is totally alright, just skip to the next step.