LINE Developers Document top Messaging API Messaging API Quickstart Overview Getting started Building a sample bot Building a bot Guides Using quick replies Using rich menus Using Flex Messages Using the LINE URL scheme Using beacons Sharing your bot with users Linking user accounts Concepts Messages Actions Flex Message elements Flex Message layout Group chats Managing roles User consent Reference Messaging API reference LINE Beacon device specification Resources Flex Message Simulator Messaging API SDKs Release notes