We believe the Easiest payment method is by: Bank Transfer.
Especially, if you are a resident of the E.U. your country is a SEPA member (Single Euro Payments Area).
As of July 2015, all 28 European Union member states are included in “SEPA” and you might want to check how much the bank charges are for such transaction. Euro transfers within EU member states are simplified and cost much less than before! The transaction costs are easily less than other online payment methods.
Otherwise, feel free to pay your workshop by PayPal.