Can I get LINE user's unique key?

When a user registered a LINE account, the user will have a LINE ID which they can share and allow others to add them by ID.

When a user add an Official Account as a friend or they send a message to an Official Account then LINE will assign an unique user ID to enable them to have send messages to each other in 1:1 chat. It is not possible for an Official Account to send messages to a LINE user using their LINE ID. When Conversation API receives a user's message, a Contact will be created and the unique key will be stored as Contact ID.

Learn more

• Find out more about the Sinch LINE for Business Channel
• Sinch Developer Documentation site contains comprehensive documentation and tutorials, which show you how we support LINE through the Sinch Conversation API.