Multi-Modal simply means you can order how you like, in multiple ways, but pay on one bill. In the above scenario, the family simply scans the QR code on their table or the bill at the end of their meal & can pay (or split the bill to charge Granny for the sambuca) from their phone.
No arguments.* No card readers. No need to download an app.
*No arguments about ordering, we can’t stop family arguments about the sambuca shots.