sad_trombone

IMHO it doesn't seem legit that they can initiate transaction for X amount, give you a receipt where you can write amount Y, and then charge you for X+Y sometime later.

I really don't want to deal with my bank if by some chance amount Y is not what I wanted.

From my (European) point-of-view this seems completely ridiculous, since here I see the actual amount before I have to swipe/insert the card into the device.

However, I completely agree with you that it's not fair to the restaurant/workers if they don't actually get the tip.