Expected Behavior

When the QR-Code is activated and a customer has paid 50% of the invoice amount. If I generate a new PDF of the invoice. The QR-Code will display the remaining amount of the invoice in my banking application.

Current Behavior

The QR-Code shows me the total amount of the invoice in my banking application, not the amount still to be paid.

Possible Solution

Change the variable that sets the amount in the QR-Code.
#1129

Steps to Reproduce

1. Create an invoice with QR-Code enabled.
2. Generate a PDF and scan the QR-Code to see the total amount.
3. Pay half the invoice.
4. Generate a new PDF of the invoice and scan the QR-Code.
5. See that the sum is still on the invoice total, not what remains to be paid.

Detailed Description

It's all in the pull request. #1129