Currently payment cost can only be set at a fixed amount. Credit Card/Paypal costs are a percentage of the order amount so it is vital to have the ability to set the cost as a percentage instead of a fixed amount.
I would like to be able to add % fee to orders that use a specific payment method. For example, I want to assign a 3.5% fee to all credit card orders. At present I can assign a cost to a payment method but not a % fee.
As a webshop manager, I would like to charge the user a percentage of the total order for a given payment method.
As a webstore administrator, I need the ability to charge the customer for the credit card fees. This could be done by having the ability to add a payment cost as a percentage of the total to certain payment methods. This is especially important for B2B transactions where the margins are much smaller.