It is free to apply for the koi fish card, and there is no need to pay the annual fee and other fees during the use, but the postage of 15 yuan is required for the first card application. Koi fish card is not a credit card. There is no annual fee whether the user is activated or not. In addition to no annual fee, the card is free for life. If users want to use it, they need to install the flower-saving APP in advance. The preferential benefits of koi fish card include phone bill recharge, video membership, spike activity, and receiving full or reduced coupons. If it's online shopping, koi fish Card allows users to get preferential prices when purchasing goods in Taobao/Tmall/Pinduoduo. For example, if you buy the glory of the king coupons on the flower-saving app, 1000 coupons can save 2.5 yuan. If you buy skin with coupons, you can save tens of dollars.