How to get my iPhone 15 Pro Max original invoice and receipt?

If you bought the iPhone from an Apple Store/ the apple website, you can find the receipt by going to settings, tapping your account (at the top), tap on media and purchases, view account (you may need to enter password/Face ID), and then tap Purchase History. This will show your iPhone as one of the purchases. Tapping on it and then choosing Resend Receipt will send the receipt to your iCloud email.

Do you need to buy the iPhone 15 Pro Max? Or are you looking for the receipt?

• To buy that iPhone, go to the Apple Store site, go to your local Apple Store or go to one of the authorized Apple retailers.
• If you have already purchased it, you will have to find your receipt from them if you did not keep it. It should contain the serial number. If you let us know who the retailer was, we may be able to offer more specific information.

I just tested your suggestion. My hardware purchases are not listed there. Hardware isn't even an option in the filter: