Simple billing system similar to WHMCS and ClientExec, but without all the extra features.
Billing system needs to store, manage and edit all client information including addresses, payment information (credit card details), plan information, etc. Invoice generation (recurring as well as one-off invoices). Integration with payment processor.
System security is a priority!
Asterisk knowledge is a plus, as CDR calculation of calls may be required.
Previous experience designing billing systems is a plus. Please provide examples.
Project will be awarded to most experienced bidder with previous examples of such work.
Thank you for your bids and good luck!