In my dual role as celebrant and also bookkeeper for my wife's business (The Elopement Collective) I receive and pay invoices for the wedding photographers, florists, and celebrants she books for her elopements.
I'm convinced of this: none of you have actually ever invoiced yourself and tried to pay yourself. Are your bank details easily copied and pasted? Can you accept Apple Pay, or credit card payment easily?
For many, it's almost like you don't want to be paid.
If you do want to be paid, make it easier for people to pay you, using modern payment methods.