Comic Strips

This is mostly the same in the us. It's less common for drivers though, because you typically pay when you place the order and the driver just has you sign the paper as acknowledgement that you got the order.

This way the driver doesn't need to carry around a card machine everywhere they go, instead the slip can go right with the receipt on the hot bag, this also means the driver doesn't need to futz around with figuring out which order the tip goes to since they may have 3 or 4 orders on their run.

I delivered pizzas for a long time, there was about a six month period where we switched to square and it was horrible, people out in the country with no service meant I couldn't run their card, also since the order wasnt processed already, people would argue about the price when we got there, even though they accepted the price on the phone, trying to get a deal since we already drove all the way out.

Signing a slip of paper is the absolute fastest method for a delivery driver and there is no obligation to fill in the 'total' part, you can just put the tip value on the tip line and a line through the total, no math.

Write the number 5 on a piece of paper and that's it, faster than any machine, no hiccups with cell service, no batteries to keep charged, no greasy fingerprints on the screen. No worry about dropping it down 15 stories of stairs at a hotel, etc.