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What you can do is to implement your own ICouponFilter, then in
Filter(PromotionFilterContext filterContext, IEnumerable<string> couponCodes)
write logic to decide if a promotion should be excluded based on the provided coupons
I am implementing an ecommerce site which provides coupons to be used in partner sites. The coupons can be unique or same for all relying on some business. The concepts of coupon in EPiServer seems different. How to implement this?