How to tip on a credit card at a restaurant?

What s the procedure to tip on a credit card? Waiter brings bill, I give credit card, waiter scans card and returns with two receipts, one is my copy one is theirs that gets signed and filled in with the tip amount. Once writing on their receipt I can leave, correct? Because I ve had two recently that didn t... show more What s the procedure to tip on a credit card? Waiter brings bill, I give credit card, waiter scans card and returns with two receipts, one is my copy one is theirs that gets signed and filled in with the tip amount. Once writing on their receipt I can leave, correct? Because I ve had two recently that didn t have the tip added to my card.

And I understand tipping in cash may be better for the wait staff, but it s not always viable.
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