Is it credible to subtract 9.9 from Tik Tok women's coupons?

Coupon: a marketing promotion tool made by a platform or a merchant and distributed to users who meet the requirements for receiving coupons, which is used to offset the price of goods when placing an order.

Merchants who open stores in Tik Tok usually use coupons, such as store coupons, anchor coupons, platform coupons, etc., so merchants should also abide by the rules of the platform when using these coupons.