Gift Certificate Fix

I need someone that knows php and smarty to fix the gift certificate feature on my x-cart shopping cart. Right now the shopping cart requires the customer to purchase an item that matches the amount of the gift certificate in order to use the gift certificate. What I need is if a client buys a gift certificate for say $20 it needs to be taken off the amount owed and then leaving the total balance to be paid by credit card or whatever. If the item being purchased is less than the gift certificate then the amount of the purchase needs to be subtracted from the amount of the gift certificate, thus resetting it to be used for a future purchase. Full access to the code will be allowed, but must be distroyed upon completion. Since this is a finished project that currently has code in it for a coupon that works almost the way the certificate should it should be an easy mod to copy that code and intigrate it into the gift certificate code some how. This mod needs to have an installed script as to be able to modify a couple of carts. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Installation package that will install the software (in ready-to-run condition) on the platform(s) specified in this bid request. 3) Complete ownership and distribution copyrights to all work purchased. ## Platform Linux, UNIX ## Deadline information Must be completed by 12/12/2002