Hi Luciddream0411!
 
I also love the idea of letting customers pay in bulk or whatever the amount is on a statement. I'll take note of this as a suggestion for future enhancements.

If possible, you can let your customer transfer funds to your bank account. Then, just pay the individual invoices on your QBO, and email them the receipt.

On the other hand, paying via QR codes or a link is currently not a feature in QBO. However, you can share the link of your customer's invoice so they can open it using a mobile browser and pay the invoice.

If there's anything I can help you with receiving payments, feel free to comment below.

Have a good one!