Can I set in the system the 3% charge when the guest pays by card? / How to add surcharge for any payment type in PMS?

1. Click on Go to Configuration.  

2. Click on the Settings option.
3. Click on Payment.
4. Click on the Plus (+) button to add a new entry.

5. Select the Surcharge Setting.
6. Click on the Save button to apply the changes.

To add surcharges on payment type, select one of the extra charges to post surcharges, create one extra charge as Surcharges.