The Pay-Per-Sale Credits on your invoice are the cost of online payments (e.g. gift vouchers) and charges for express priority Helpdesk tickets. This cost is € 2,5/sale (excluding VAT) + about 2,5% transaction fee. The transaction fee is deducted directly from the payment and you will receive a monthly invoice for it.

The cost of € 2,5 excl VAT is billed in the form of Pay-Per-Sale Credits. These are always charged per 30 and remain valid as long as they are not used. An overview of usage can be consulted via:  > Account > Support credits.