Cart script to disable promo codes for users with a tag
I've read all the stuff on the forums on the topic, it appears as if cart scripts do not support a methods of preventing users from using a promotion code.
Our situation is this, wholesalers have a "wholesaler" tag, and we run cart scripts to determine their discount rate based on their cart value. However, wholesalers are not allowed to use promotion codes because if we give them 15% OFF as a wholesaler, and we run a separate promotion for 10% off, then they can combine the two for 25% OFF.
There needs to be a way to interact with promotion codes in cart scripts to either increase the value of the cart by the promotion's discount, or simply ignore the promo code all together.
Is there a way to do this? If not, when will it be available?