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Here's how it's implemented on the one that's used pretty much everywhere where I live.

Option 1: Everyone orders and pays independently. Website takes payment through all the usual options + Apple/Google pay. So long as the whole table orders within 5 minutes, all the orders come through at once.

Option 2: One person sets up a tab, which generates a QR code. The other guests scan that code instead of the one at the table. People can order their own food/drinks as above until the tab owner closes the tab. If you forget to close the tab it closes itself at the close of business.

You peeps don't have easy "hey could you pay this amount" apps? Even if the app doesn't have split billing you can still transfer money afterwards

In Spain it is normal for the terminal to come to the table and the payment gets split up however those at the table like.