This is a pre payment for accommodation or other services. Amount of the pre payment can be found from your invoice/ booking confirmation. Choose as many pcs as the pre paymet is. 1pc = 1€. If your pre payment is 150€, take 150pcs and the total sum will be 150€.
Fill your personal details, invoice number and choose the payment method. When you have paid the pre payment a receipt will be send to your e-mail.