If you use a no default checkout, like onestepcheckout you have this error and customers can't complete order with credit card, so you have to change this file js/paymill/PaymillHelper.js, function PaymillHelper.prototype.getShortCode = function().
We have chenged it for magestore onestepcheckout
PaymillHelper.prototype.getShortCode = function()
{
var methods = {
paymill_creditcard: "cc",
paymill_directdebit: 'elv'
};
$$('input:checked[type="radio"][name="payment[method]"]').pluck('value');
if ($$('input:checked[type="radio"][name="payment[method]"]').pluck('value')) {
return methods[$$('input:checked[type="radio"][name="payment[method]"]').pluck('value')];
}
return 'other';
};
If you use a no default checkout, like onestepcheckout you have this error and customers can't complete order with credit card, so you have to change this file js/paymill/PaymillHelper.js, function PaymillHelper.prototype.getShortCode = function().
We have chenged it for magestore onestepcheckout