@TelaFirma:
As mentioned, there are other payment methods but credit card which are commonly go with an addtional charge. (COD here in Germany). Therfore the feature definetly shouldn't be restricted to credit cards but simply to any payment method (Just an extra field in the database and in the payment method screen of the admin area + displaying and calculating the additional cost during checkout).
The problem of illegal surcharges for credit card payments could easily solved by siimply mentioning this issue in a note at the top of the payment methods administration.
regards,
Chris
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