Requirement: payment method fee.

We've made this request several times already and it's very complicated for us to work around this basic e-shop deficiency! It's really crucial for us to be able to add a fee to payment methods, similar to what we do with shipping methods! This has long been a major shortcoming of the e-shop and we need to fix it already! It is really making it very difficult for us to run e-shops for some customers.
Alternatively, if you don't want to do it here, then at least customize the core GB so that we can do it ourselves with plugins and not be forced to hack GB. Thank you very much in advance.

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