Where is the file/code to validate a coupon?

[marcio]

I need to have a coupon only work if 2 specific products are in the cart. Right now, using restrictions, if I deny top and allow 2 products, the coupon still works if I add one product or the other. I need the coupon to be valid only if both products are in the cart.

But I can't seem to find the validation code that I need to change. Can someone point me in the right direction? Or better yet, if someone has already done something similar, can you tell me what I need to change?

Thanks.

[DrByte]

see the collect_posts() function in the ot_coupon.php module
and possibly, but not likely needed, the is_product_valid() function in functions_general.php

[marcio]

Thanks. I found it.