I already done a invoice system by myself which able to add,edit,view and delete for vendor, customer,product. The system also able to send the invoice to the customer email address in form of PDF file. I need to add new features to my system as follow :
1) Until now the system able to add the sales and send to the customer email in form of PDF but i want to make it editable which able to edit the sales by the admin
2) Messaging system - able to send email and SMS to the customer(separately)
3) Set the deduce the number of stock based on the quantity of the sales.
4) Login access
This project need to be done very urgently...