Users are able to subscribe through both Google Play Store and App Store using the same account

[data-sync-user]

Important details: 

• both IAP subscriptions are listed in the +Subscriptions+ page; 

• also reproducing if first subscribing on iOS and then on Android;

• not reproducing if the user is not signed in on both devices before finalizing the subscription;

Version / build found in: 

• 2.20.0 (2.202401111523)

Reproducible on:

• Android 14;

• iOS 16.5;

Prerequisites:

• Have an Apple ID (sandbox account) which is not associated with a Fx account (no prior subscription);

• Be signed in Google Play Store;

• Have Mozilla VPN installed and open;

• Be on Stage server;

• Have a Fx account without subscription or create one;

Steps to reproduce:

1. Sign in with the account from prerequisites on your iOS device and remain in the “Subscribe to Mozilla VPN” screen;
2. Go to your Android device and sign in with the same account from prerequisites;
3. Subscribe to any subscription plan from the “Subscribe to Mozilla VPN” screen on your Android device;
4. After finalizing the subscription, go back to the iOS device and subscribe to any plan from the “Subscribe to Mozilla VPN” screen;
5. Observe the behavior;

Expected result:

• The user is not able to finalize the subscription, as they are already subscribed via Google Play Store;

Actual result:

• The user is able to subscribe twice, via both Google Play Store / App Store;

Notes:

• See the attached ss and logs;

┆Issue is synchronized with this Jira Bug ┆Reporter: Bianca Hidecuti