Purchase history can be found in the settings of each platform:

iOS:

1. Open the Settings app.
2. Tap your name, then tap Media & Purchases.
3. Tap View Account. You might be asked to sign in.
4. Tap Purchase History.

Android:

1. On your mobile device, open the Play Store.
2. At the top right, tap your profile icon.
3. Tap Payments & subscriptions Budget & history.