How do I get my iPhone 15 Pro receipt for February 2024?

If you purchased directly from Apple, either in an Apple-owned retail store or from the Apple online store, the invoice is available for approximately 18 months from time of purchase by viewing your Apple account.

https://account.apple.com/

Otherwise, contact your carrier or the shop where you bought the phone.

Contact the store you purchased it from and ask them for the receipt.