I need a receipt for an order

Viewing & Changing Orders - Shopping Help - Apple - https://www.apple.com/shop/help/viewing_changing_orders - "Once an item is shipped or picked up, Apple will create an invoice for your order. To view or print your invoice, go to your Order Listing (Opens in a new window) page and select an item to go to the order details. Then, select View Invoice at the top of your order details page to access your invoice. If you need help viewing or printing your invoice, speak with an Apple Specialist at 1‑800‑MY‑APPLE."

For iTunes and App Stores purchases you can see receipts in your purchase history by clicking here --> https://support.apple.com/HT204088

Apple also emails you a receipt for any charge made to your account. "Search your email for the words “receipt from Apple” as indicated in this support article --> https://support.apple.com/HT201382