App Downloads
You can find your Purchase History on your Apple device by using the following steps:
Open the App Store app
Tap on your Apple ID icon
Tap on your Apple ID details
Scroll down and select Purchase History
Select the date range for when you made the purchase.
In-App Purchases
To view your in-app purchase history is slightly different and requires the following:
Open the Settings app
Select iTunes & App Store
Tap you Apple ID at the top
Select View Apple ID from the alert
Scroll down and select Purchase History.
Tap Date Range and select the when you bought the app.