In India, most of the shipping companies charge the seller additional fees if the customer is paying them cash at the time of delivery. I need to charge customers a fee if they choose Manual Payments such as Cash On Delivery. Currently, wix doesn't have a feature where I can charge customers only in the case of Manual Payments. Is there a code or any other way to charge customers opting for Manual Payments OR charge everyone a handling fee irrespective of their mode of payments but provide a discount coupon to only those who are doing an online payment OR Cashback for customers using online payments? Any help will be appreciated.