Gift Certificate Redeemable For Specific Item, One Time Use

General General Questions
1

Anyone know if there is a way to do this? Here's what I'm looking for:


  1. Unique code that can't be used by more than one customer (hence the use of GC instead of a coupon code)
  2. No cash value to the GC
  3. Makes a specific item in the customer's cart free (it's a digital item)
  4. Can't be reused / shared (see #1)



    CS Cart won't allow me to create gift certificates worth less than $10 but I figure I can satisfy #2 by tweaking the value of the GC in the database directly (setting it to $0.01).



    However, if the GC is worth $0.01 and the customer simply uses it to make the target product free, they won't ever zero out the GC and the code could be passed around to others.



    Any ideas?
2

I've made some progress on this via custom add-on. It hooks into calculate_cart_items and if the gift certificate being applied is worth $0.01 AND my target product is in the cart, it reduces the price of the target item to $0.01 (it's normally $24.99).



This seems to work correctly all the way through checkout and even updates the price back to $24.99 if the user removes the $0.01 gift certificate. However, I'm having a problem getting the price of the cart item on the checkout page to update after the user inputs (or removes) the gift certificate code. (see attachment)



If I hit recalculate it updates the price display and it also updates if I “Proceed to Checkout.” But how to get the item price display to update immediately after the gift certificate is applied?



Here is basically what I'm doing in my calculate_cart_items hook:



$cart['products'][$prod_id]['price'] = 0.01;
$cart['products'][$prod_id]['display_price'] = 0.01;
$cart['products'][$prod_id]['base_price'] = 0.01;
$cart['products'][$prod_id]['stored_price'] = 'Y';
$cart['recalculate'] = true;




The only thing I can think is that the calculate_cart_items hook is being called AFTER the cart items are parsed. Is there a different hook I can use to update the cart item prices before they're parsed? Or is there a way to duplicate the functionality of the “Recalculate” button without sending an ajax/http request since this seems to update the item price display?



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cart_ss.jpg