Astrisk billing system intergrated with WHMCS.

Hi ALL We have just setup the elastic system , now we need someone who familiar with FREEPBX and asterisk , to bring us a solution for prepaid and post paid billing system. We had experience with WHMCS, was wondering if someone would be able to develop a interface for the end user for them check their bills and pay it through whmcs. Requirements: Enviroument: We have been elastic install, whmcs installed, credit card gateway installed. Currently recurrently billing work fine. 1. Develop a billing module for whmcs -show monthly bill and current bills, be able to generate monthly bill and email to the client automatically.(data will need to be retrieved directly from elastic or freebpx or asterisk or a2billing) -on the invoice due date, the system will automatically charge on their registered credit card profile that had with the WHMCS( so called action) 2. If you have alternative solutions, please let us know , we will put into consideration. Thanks.