If the user authorizes Cainiao to query the items reissued by Douyin shopping merchants, they can directly log in to Cainiao to see them. As long as the user's mobile phone number is used as the delivery number, the system will automatically capture the courier number. But if the user does not authorize the query, he must ask the customer service for the courier number himself, otherwise the courier company will not be able to find the courier number with only the mobile phone number.