promo code system

using google checkout & paypal

[sakredei]

i was hoping maybe someone can point me in the right direction here: i am selling something online, but only a single product, so i don't really need a shopping card. for now payment is just processed through google and/or paypal. my problem is that i have many different promo codes so that i can track who is referring the customer, but i'm not sure of the most effective way to implement a system to change the price. anyone have suggestions to another post in regards to this or maybe some kind of open source code i could start with?

[coopster]

I don't off hand, unless you downloaded the source code for one of the more popular open source commerce solutions and scanned their code. However, I believe this would be fairly simple for you to implement yourself using a switch [php.net] or other control structure in your form processing page. Pseudocode ...

switch ($promoCode) { 
case 'BIGPROMO': 
 $discount = 200.00; 
 break; 
case 'MEDPROMO': 
 $discount = 100.00; 
 break; 
default: 
 $discount = 0; 
}