A warm welcome to you aleciakellymilli,
QuickBooks Desktop allows you to customize invoices and other forms such as Credit Memo, Sales Receipt, P.O, Statement, Estimate, and Sales Order.
At this time, the option to customize payment receipts is unavailable. This is a great feature to have though!
I invite you to make your voice heard by sending feedback directly to our product development team. You can go to Help, click Send Feedback Online, then choose Product Suggestion.
You can always come back here in the Community forums if you have other questions.