Und mit Debit Card ist nicht zufällig nur die EC-Karte gemeint?? Pre-paid wird ja auch akzeptiert?! 

Folgendes steht bei Global Journey:

Check if the spending limit of your credit card is high enough and if you are allowed to make international payments (to Belgium). Otherwise please contact your bank.
For Global Journey we only accept the following payment methods:

Visa Credit (+2.5% credit card cost)
Mastercard (+2.5% credit card cost)
American Express (+3.5% credit card cost)
Diners (+3.5% credit card cost)
Pre-paid creditcards (depending the type of the credit card)

Debit cards will not be accepted.