POS for restaurant and in person purchase

I recently obtained the card reader from Wix POS. I had been told that I can link it to the online order (new) and somehow set it up for customer to pay in person only. Is it possible to set it up like this? If so, what is the process? We have been unable to figure out how to do this and YouTube or Wix site doesn’t explain how.

We had also been told we could set it up on Wix Store (Shop) however, this is super inconvenient for a restraunt style setup. Our main goal is to not get charged the extra .20 or .30 cents, this way we will not need to raise the price on our customers.

Thank you in adcance!