How do I find a receipt?

On your iPhone, iPad, or iPod touch

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.
5. Your purchase history appears. Tap Last 90 Days, then select a different date range.

Here is a one-stop link for billing questions→Subscriptions and Billing - Official Apple Support. You can review your purchase history to see what you were charged for, cancel a subscription and request refunds.

You should have also received an email receipt for each purchase.