zen 1.3.7.1
I want to prevent customers who already have Group Discounts from making use of a Discount Coupon.
Supposing I test for this in ot_coupon.php, is there an easy way to check an order to see if any Group Discounts have been used?
I can code php ok, but I have a lot of trouble understanding zen structure and code. I would greatly appreciate it if someone could post a snippet of code that would test this condition. Or point me to some existing zen code that tests this.
Thanks,
~David
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