Build an Online Credit Voucher Store

Customer 1. Logs in or Creates an account with his/her e-mail address and authenticate his/her paypal account to work with the store 2. Once logged in, they'll see 12 kinds of credit vouchers 4. When they click on any of them, money gets in the store's paypal account and the credit voucher code is displayed to them and sent to his/her e-mail address. Administrator 1. Inserts the credit voucher codes/numbers (the credit voucher codes/numbers stay there until a purchase is made. When a purchase is made, the next credit voucher code/number in line will be the next to be displayed) 2. Is able to see sales history 3. Is able to see how much credit voucher codes are left in each of the 12 categories