User information is not disclosed, and can only be checked in the following cases:
• If a user contacts your LINE official account via chat
You'll be able to check some of their profile information (display name, profile photo, and status message).
• If your LINE official account is using the Messaging API and a user adds you as a friend, sends you a message, or otherwise directly interacts with your account
In addition to the profile information mentioned above, you'll also be able to send that user messages using the unique internal identifier we've assigned to them.
• If you are using the Messaging API and a user adds your LINE official account to a group or chat
With a Verified account, you'll be able to see some profile information (display name, profile photo, and status message) as well as the internal identifiers of every group or chat member.
Note: Unverified accounts can confirm the same information, but only for users who send messages in the group or chat.