How to Pay a Tip in a Restaurant?

i wasn't expecting that well, but it was actually really tasty. Within a couple of minutes, i'd forgotten that there was blood and axly taste very nice. I love things like black pudding morthea, which is mostly blood. But ijust wasn't expecting them to pour blood into the soup, like ten minutes before it was ready. That is unusual. Craig, do you mind paying a tip with your bank card, not in cash, specifically with your bank cards? How does it work? Do you need to say, can you ad ten % on the bill? Or does or a selacific price? Because if someone gives me the bill, if i pay by