Step 1: Navigate to Settings.
Step 2: Proceed to System Settings.
Step 3: Click on Payment.
Step 4: To enable the credit card fee, check the box.
Step 5: If you wish, modify the label.
Step 6: Click Save to apply the changes.
If you decide to disable the credit card fees later, follow the same steps.
Step 7: Go to the Payment tab.
Step 8: Uncheck the box.
Step 9: Click Save to confirm the changes.
