Billing Software adjustments - in asp.net

Billing Software adjustments We have ASP.Net V 1.12 billing software with source code as at ([login to view URL] -) in asp.net – with vb.net and ms sql server backend I need the following minor adjustments to the software – which should only take a few hours or so todo 1. Reoccurring products : I need to be able to add reoccurring products – add checkbox, reoccurring date - need a script that will check the reoccurring column and if its checked, will check the reoccurring date, and create a new invoice and email customer invoice – based on reoccurring date and invoice amount - this will run daily using a cron job (software already emails customer invoice and reminders this would just activate it and automate the process) 2. Reporting: Need a report of all sales paid in a period – using calendar control for start – end date and then it displays a customer name, description, amount tax, total for customer and then at the bottom it displays total net, total tax and total inc total for all sales. (we have asp.net calendar control) – Also need 3 print functions for this – a) print out report b) print out invoices for any one client c) print out all individual invoices 3. Reminder script – need a script that will run every week and for all invoices that haven’t yet been paid will email them a reminder email for each one if the due date is greater than 2 weeks and if email reminder is turned on for each invoice – again uses cron job and the software already send out reminders – just need to automate this process 4. Paypal/2checkout returning url – the software accepts payments through 2checkout and paypal and should return the user back to the software and then records the payment in the database – this is included in the software but we had someone make adjustments to the software and after that this feature stopped working – it should just be some minor code fixes for this as it already does all the payment processing etc We will provide access to the software source (asp.net 1.1 with vb.net) and ms sql database on our servers. Payment in GAF escrow at project completion and we would like the project completed within 4 days