a2billing customer portal

a2billing customer portal we have an existing asterisk, elastix, a2billing site. we are developing a new website and product offering that will use the existing above installation. the new product will be a DID number plus a minutes based call forwarding package. customers will need a customer user portal to view their calls, credit remaining, purchase additional credits, cancel account, etc., etc. customers will need to login to their account on the website to perform these functions. the database and selection of the DID number is NOT part of this job, but it could be. the successful bidder should have examples of previous work for viewing.