Buyers can click on the other party's icon to check his basic information first, and preliminarily determine whether the user is registered on Alibaba. If he is registered and is a certified member, you can click on the profile to view all the seller's information, and there are third-party certification information, etc. If he is not a certified member, you can find his contact number. It is best to contact him using his company's landline, and ask him to fax valid documents such as tax registration certificate, business license, enterprise code certificate, etc. You should also carefully check whether the business license has participated in the annual review of the year and whether it is valid. After completing these, you can rest assured to do it.