entitlement
Proof on your server that a user has paid access to a feature, such as a subscription.
Think of a festival wristband that gets you into the VIP tent. An entitlement is the record that says this user is allowed into a paid part of your app.
It usually comes from an in‑app purchase or subscription. The server keeps this record so the app can check it even if the phone is offline or the app is reinstalled.
In practice, the store returns a receipt, a proof record, after payment. Your server verifies the receipt, writes an entitlement in the database, and the app checks that entitlement before it shows premium screens or removes limits.