You can check it by logging in to the Aichacha website.

Register a personal account, log in to the personal account, enter the queried Want Want number, and wait for the result. The Taobao account marked by the merchant refers to the buyer's account where the order was placed, causing the order to be downgraded. Generally, such a buyer's account will be defined as a downgraded account, which will be marked by the merchant on the third-party platform. Then when other merchants query, they will see that the buyer's account has a downgrade mark.