Sebastian Vassiliou's Products

Payment Gateway Module for the Swiss PostFinance e-payment service

Create Swiss QR and ISR/ESR/BVR/PVR payment slips and automatically apply payments

Payment Gateway Module for the Swiss DataTrans e-payment service

Payment Gateway Module for PayPal PLUS Germany

Checks every website you host and alerts you if there are problems

Pushover Notification Provider for the WHMCS Notification System

Mail printed invoices worldwide via pingen.com

Elegant and professional looking PDF invoices and quotes

Payment Gateway Module for Wallee enabled providers such as PostFinance Checkout and others

The RRPproxy / Key-Systems Registrar Module connects WHMCS to your RRPproxy account.