You can use the following from https://www.apple.com/shop/help/viewing_changing_orders to see the order details:
Sign in to your Order Listing
(Opens in a new window)
page and select an item to view your order details.
The invoice isn't available until the item ships. See the following from 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.