The customer buys a Calling Card from site.
Customer dials a local Voip number OR 1-800 number.
It will ask pin than destination number . After connecting destination it will prompt talk time.
I need to setup system with asterisk , a2billing and PayPal integration.
75% of the payment, there is completion, 25% a week later after eliminating errors.
I already have the prepaid solution, and it is running in the production environment for last year and half. If you want I cant make that useful for u.
-FQ