We have been using the Jelastic WHMCS billing extension right from the start. It allowed us to leverage an existing billing platform we were already using instead of having to spawn "yet another" platform to manage. The system works well and has been stable. We're offering CC, Paypal and Bitcoin using WHMCS and the response from customer has been great with minimal issues as the customers also know the WHMCS platform. We've been very happy with the support of the module by the Jelastic team and they have stayed current with releases as WHMCS has upgraded. A+ to Jelastic on this Extension. Billing for resources are stable and reliable.