Coupon cannot solve my problem.
Suppose I want to give discount for many shops.
Group A - 50%
Group B -30%
Group C -10%
And customer use only one coupon code.
If he use in Group A shop, the coupon will discount 50%
If he use in Group B shop, the coupon will discount 30%
But what I found is that a unique coupon code cannot handle that.
That's why?
