Astpp 3.5 weekly billing

Hi I need to modify ASTPP so I can have weekly billing. I need you to know ASTPP, I have started to make the modification and it is almost ready, so I can't afford losing time explaining further. If you know ASTPP and know how to do it (its an easy few lines modification). Please apply. Below the exact modification i need to get: - I should be able to chose weekly billing and pick up the day where it will be billed. Example: Monday. - It should generate the invoice from last Monday at 00:00:00 hours till Sunday 23:59:59 (If I chose Monday weekly billing). - It should include the destinations that were called in the invoice and not STANDARD CALLS as it appears in the regular ASTPP 3.5 implementation. The code should be neat and clean.