Thanks for joining in on this thread, MaryBethP.

I'd like to share some steps about your situation.

When your QuickBooks Payments is enabled, you can create custom Payment Links for your customers. Then, copy the auto-generated link and paste it in the Message on invoice field of your customer's invoice. 

Additionally, you can share the link via text message or alternative messaging channels. If you want to use the QR code option, I've got this article for more information: Payment links in QuickBooks Online Payments.

If there's anything else you need, please feel free to leave a comment below. We're always around to help. Have a great day ahead!