Android Question Save bought contingent points

[Blueforcer]

Im creating a small Game for Android and iOS where users can buy contingent per inApp purchase.
What is the best way to save this contingent, to persist after reinstallation without a own server?

 

[Alexander Stolte]

to persist after reinstallation without a own server?

Since there is no similar feature in Android as there is in IOS for the keychain, there will probably be no secure option without having your own server.

 

[Blueforcer]

Since there is no similar feature in Android as there is in IOS for the keychain, there will probably be no secure option without having your own server.

Would be FirebaseStore or Google Play Saved Games Service a good option?