Wǎnghóng zǒng shì zài shìpín lǐ fā zìjǐ de yōuhuìmǎ.
Influencers always post their own promo codes in their videos.
Tips
usage
优惠 means "favorable, preferential," 码 means "code" — a direct calque from English. Compare 优惠券 (coupon, the physical/voucher sense), 折扣码 (discount code), 红包 (digital cash gift — which can also act as a discount on platforms like Taobao).
