The three preferential codes of Amazon Promotion are: preference, unrestricted, exclusion. 
1. ] It can be used with all Unrestricted type promotions;
can be used with all the promotion of all non -set coupons code;
If you create more An promotional coupon code for the preference type, then buyers can only receive the biggest discount of discounts.
Example: Preference For example, you created a Preference type coupon code: 10% off shoes and a unreastricted type coupon code: 20% Off Hats. Then when the buyer purchases a pair of shoes and a hat at the same time, when the code is superimposed, you can get 30%discount.
For example, you have created two Preference type coupons code, such as: 10% off Shoes and 20% Off Hats. So when buyers buy a pair of shoes and a hat at the same time, because the same type of code of the Preferences cannot be used, they can only take the highest value, so the buyer can only get 20%discount!
2. What is the type of unrestricted coupon? It can be superimposed with all the unrestricted type coupons;
can only be used with a preference type coupon; Overlap.
Example: Unrestricted
For example, you created three unrestricted promotion code: 1. Freshly shipped at full 20, 2. 10 % off clothes, 3. 3. Buy a hat and send a pair of gloves. Then the buyer purchased clothes, hats at the same time, and 20. Then the buyer can get 10 % off clothes, a hat, a pair of free gloves and free shipping! As mentioned earlier, the Unrestricted type coupon can be used once with a Preference type coupon.
In short, it is a coupon that can be used in the same type.
3. What is Exclusive coupon type
Can not be used in any coupon code, including the exclusive itself, the coupon itself can be superimposed with any promotion without a coupon code code use. In short, except for the preference of the Unrestricted and non -coupon code promotion, other promotion can be used, including itself, including itself, including itself.
This time, Amazon canceled this type of coupon. From the above example, I can see that Amazon's method will inevitably affect the traffic of the seller. In this case, how should our sellers deal with it?
1. Consider creating the preferencetial discount code;
Note that if there is a product set up the unrestricty infinite discount code, it will be superimposed together. 
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