Every system I've used and currently use you enter the tip amount, so writing how much you want to tip is actually fine. Though I'll usually ask for you to write in the total or ask if it's fine if I do. Technically the cc company cares about that line in case of disputes.
Every system I've used and currently use you enter the tip amount, so writing how much you want to tip is actually fine. Though I'll usually ask for you to write in the total or ask if it's fine if I do. Technically the cc company cares about that line in case of disputes.