Processing , pre authorizations and a force with credit card merchant transactions?

Hoosier G asked:


I have a question about how POS or point of sale applications work.
I would do a pre authorization of a customers card and give it to them to add a tip to it.
Then I process it again as a credit card transaction so that it now includes the tip.
Then I do the force at the end of the day to drop the preauthorization?
Is that the normal way it works.

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