This applies to both Global Payments–integrated and non-GP (payment taken outside the software) setups — the surcharge/discount amount is a payment-type setting, not a processor setting, so it configures the same way either way.
Steps:
Go to Miscellaneous → Accounts.
Expand Account #1010.
Select the payment type you want to modify (e.g., Visa, MasterCard).
Click Edit.
Enter the Surcharge/Discount amount:
Enter it as a percentage or a flat rate.
Use a positive value to charge the customer (surcharge).
Use a negative value to apply a discount (e.g., a cash discount).
Check Used for Receipts so the surcharge/discount reflects on receipts.
Choose whether the surcharge/discount applies to the buyer or the seller.
Click Save.
Note: This change applies to invoices going forward — it does not retroactively apply to existing/past invoices.
Disclaimer: Surcharging is subject to rules set by the card networks (Visa, Mastercard, etc.) and by state or local law, which vary by location and can change. It's your responsibility to ensure any surcharge you apply complies with the standards set by the applicable card brands and governing bodies — Auction Flex is not responsible for compliance with those rules.