Any experience with viobill.com and/or wirecard.com?

I'd reccomend 2Checkout.com or Authorize.com over those two CC processing services.

1. viobill - drop them. Non-reliable guys. The had 3 tries to run own cc processing biz but they used non-aggregation account for aggregation and non-adult accounts for adult sites. They made big problem for South Africa processor doing cc processing on non-adult account for forbidden by VISA/MC adult content like zoo and rape.
2. wirecard.com - you must have a company in Europe Union to apply for account with them. Good merchant provider.