Invoice for purchases made on App Store

Solution 1:

You can get access to invoice for any past purchases made on iOS or Mac App Store from Apple's Report a Problem website.

Open the website and login with the Apple ID that was used to make the purchase.

Report a Problem website also lets you fetch invoice for any services from Apple you are subscribed to.

Solution 2:

To see your past App Store purchases, follow these steps:

On a Mac

1. Open the Music app or iTunes. From the menu bar at the top of the screen, choose Account, then click View My Account.
2. On the Account Information page, scroll down to Purchase History. Next to Most Recent Purchase, click See All.

3. Find the item. It might take a moment for your Purchase History to appear. If you want to see purchases that you made more than 90 days prior, click Last 90 Days, then select a date range.

On an iOS/iPadOS device

See your purchase history on your iPhone, iPad, or iPod touch

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

4. Your purchase history appears. If you want to see purchases that you made more than 90 days prior, tap Last 90 Days, then select a different date range.