For those of you struggling with scan to pay. A pnp supervisor walked me and 3 of her colleagues through the steps.
Total > mobile > mobile tender > masterpass.
Then scan the qr code.
This was for pnp, not sure about other vendors' processes.
Hopefully this helps you guys out.
Supervisor also showed me so I could tell the cashiers next time. Believe the first instruction is “VAS tender” before the mobile option. Might depend on till software or setup but worth noting that part just in case.