Chat channels
Set up LINE
The assistant on a LINE official account — people message it directly, one to one, or @mention it in a group chat. Replies are push messages, so they work on every LINE plan.
Before you start
- A LINE Developers provider and a “Messaging API” channel — creating the channel also creates the official account people will message.
- Its Channel secret, on the channel's Basic settings tab — it lets the assistant verify that every incoming message really comes from LINE.
- A long-lived Channel access token: on the Messaging API tab press Issue next to “Channel access token (long-lived)”. Replies are sent with it.
- Chat channels → LINE: paste the Channel secret and the Channel access token. Create, then Test — the result names the account (“Connected to LINE as …”).
- Open the channel's checklist for the webhook URL. In LINE Developers → the channel → Messaging API, set the Webhook URL to it, enable “Use webhook”, and disable the auto-reply messages under the official account's response settings.
- Add the account as a friend (QR code on the same page) and message it to confirm — the checklist ticks “First message received”.
How people use it
One to one, a person just messages the account; /new starts a fresh conversation, /help lists the commands. Only text is read — a sticker or image gets a request to type the question. In a group chat or room the bot answers only when @mentioned, and — unlike most other channels here — there's no separate setting for whose access those group answers use: they always run on the asker's own access, visible to everyone in the chat, so ask privately for anything sensitive. Replies are push messages carrying the answer's short form with its [n] markers, cut at 4,900 characters.
Access
LINE user IDs are app-scoped and opaque, so nobody can be set up by them ahead of time. Anyone who messages appears in the people list (Manage people) as “not assigned”; pick their account and press Assign to give them their own document access from the next message. A signed-in teammate can also link themselves: “Link messaging apps” in the web chat gives a one-time code, valid ten minutes, to message to the official account. Anyone not assigned is a guest: told how to link in a one-to-one chat unless guest access groups are open on this channel, in which case they read from those groups; in a group an unassigned sender is simply not answered.
Replies are push messages — LINE's free plan meters them monthly, so mind the volume on a busy account. A delivery whose signature doesn't match the Channel secret is dropped. Test fails when LINE rejects the access token; issue a fresh long-lived token on the Messaging API tab and paste it in. Disabling the channel stops answers at once and keeps its setup and history.
Last updated 20 Sep 2026