A2billing whmcs integration.

I basically need the following: It must do integration/communicate between A2billing (on freepbx) and WHMCS. It must be a set of a2billing server automation modules and an addon for WHMCS that allows for the creation, termination, suspension and un-suspension of reseller, client and extension accounts on a2billing servers. It also allows automated 'pre-paid airtime' / 'pre-paid calling time' allocation AND 'post-paid limit' increases to reseller, client or extension accounts on my a2billing server. It must be a VoIP related server provisioning & automation product for WHMCS, and must provides an easy way of adding completely automated VoIP products to my current product portfolio through my WHMCS online store.