How do restaurants charge your card for the tip if they already ran your card and gave it back to you before giving you the receipt you wrote the tip on?
In: 169
Not sure about all areas but in Canada terminals can be in Pre-authorization mode or final mode.
Pre-authorization usually goes for more than the total. So if $100 charged the terminal just asks the bank “is this card good for $120” and gets a yes or no. The amount is not posted until it is finalized. It can be changed before posting.
Most restaurants and gas stations use this mode. There is also a final mode that most other stores use and the amount cannot be changed.
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