I'd like to make sure we're on the same page, grantmilner.
Are you trying to record a receive payment for your customers in QuickBooks Online Mobile app? If so, you can follow the steps below.
For Android phones, here are the steps:
For iPhone, you can follow these steps:
I've got this article for the other steps: Receive an invoice payment using the QuickBooks Online app.
If you're referring to something else, please let me know and I'll get back to you. Thanks.