How to activate Wechat membership card?

when calling the activation API https://api.weixin.qq.com/car.
, you need to input the code parameter, and pass the code value returned after collecting the card coupon to report that the code value is invalid.

after troubleshooting, This code value needs to go through the online decryption card volume API: https://api.weixin.qq.com/car., However, calling this decryption API also reports the following error
errcode: 40075
errmsg: invalid encrypt code hint: [U77xuA0696ent3]
this error. What should I do with it?

Mar.09,2021
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