For customers integrated with Payroc or Gearfire Payments for credit card transactions, we offer a store level surcharge setup.
The Store Level Credit Card Surcharge feature allows you to charge a credit card surcharge up to 4% based on settings in MicroBiz.
The option will automatically be available in your Store Settings if a register under the store is paired to an Gearfire Payments or Payroc credit card terminal.
Important Note: These settings will only appear if you have a valid connection to a Payroc or Gearfire Payments terminal. If you do not have a merchant account with either Gearfire Payments or Payroc, this feature will not be available. Other payment partners, including BlockChyp and Global Payments, manage credit card surcharges from the terminal with the surcharge set up on the payment processor's portal.
Setup
Go to the Settings->Stores and edit the store:

At the bottom of the Store Settings page, you will see two settings related to credit card surcharging:

Surcharge Rate- Here you can setup the surcharge rate. Note that it should be in the range of 0.1% and 4.0%. If you do not want to charge a surcharge, leave the field empty. A value of '0' is not acceptable.
Surcharge Label- This is the name/label that will appear on the receipt for the credit card surcharge. Anything you write here will be printed on the receipt.
The surcharge will automatically be calculated based on the amount that is to be paid by credit card.
For partial payments, the surcharge will be calculated inside the amount entered for credit card and be included in that amount.
Refunds don't calculate a surcharge.