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# Messaging API reference

# Common specifications

Common specifications for Messaging API, such as response and rate limit when a request succeeds or fails.

# Webhooks

When an event, such as when a user adds your LINE Official Account as a friend or sends a message, occurs, the LINE Platform sends an HTTPS POST request to the webhook URL (bot server). The webbook URL is configured for each channel in the LINE Developers Console.

# Webhook Event Objects

These are JSON objects containing events generated by the LINE platform.

# OAuth

You can issue, get, or revoke the channel access token required when calling the Messaging API from the app.

# Message

You can send a message and obtain information about the sent message.

# Managing Audience

You can create, update, or delete audience. Specify the audience when sending narrowcast messages.

# Insight

You can obtain information on the number of messages sent from the LINE Official Account, number of friends, and other statistical data.

# Users

You can get information of users who have added your LINE Official Account as a friend.

# Group

You can obtain information on the LINE official account's groups and members of the groups.

# Chat Room

You can obtain information about the LINE official account's chat rooms and their members.

# Rich menu

Customizable menu that is displayed on your LINE Official Account's chat screen. For more information, see Using rich menus.

You can link the service account provided by the provider (corporate and developer) with the account of the LINE user.

# Message objects

JSON object which contains the contents of the message you send.

# Action objects

These are types of actions for your bot to take when a user taps a button or an image in a message.

# Rich menu structure

Rich menus consist of either of these objects.

Area objects and action objects are included in these objects.