LINE Channel Configuration

Connecting your Memoh Bot to LINE lets it chat with users through a LINE Official Account in one-on-one conversations.

Before You Start

LINE delivers messages to Memoh through a webhook, so your Memoh deployment must expose a public HTTPS endpoint:

• Set MEMOH_WEBHOOK_PUBLIC_BASE_URL to your public HTTPS origin (no path, port, or private address), or
• Enable the Cloudflare Quick Tunnel profile in the server deploy stack, and Memoh will obtain a public URL automatically.

Outbound images are also fetched by LINE's servers from your deployment, so the same public HTTPS requirement applies to sending pictures.

Step 1: Create a LINE Messaging API Channel

1. Go to the LINE Developers Console.
2. Create a provider (or pick an existing one), then create a Messaging API channel. This links the channel to a LINE Official Account.
3. In Basic settings, copy the Channel secret.
4. In the Messaging API tab, issue and copy a Channel access token (long-lived).

Official Guide: LINE Messaging API - Getting Started

Step 2: Configure Memoh

1. Go to your Bot's Platforms tab in the Memoh Web UI.
2. Click Add Channel and select LINE.
3. Paste your Channel Secret and Channel Access Token.
4. Click Save (or Save and Enable). The webhook callback URL is generated only after the configuration is saved.

Step 3: Register the Webhook

After saving, the panel shows a read-only WebHook Callback URL in the form:

https://<your-public-base>/channels/line/webhook/<config_id>

You have two ways to register it:

• Click Set in LINE — Memoh writes the webhook endpoint into your LINE channel directly through the Messaging API. Save any pending changes first, otherwise the button reports an error.
• Or click Copy and paste the URL into Messaging API → Webhook URL in the LINE Developers Console manually.

Then, in the LINE Developers Console, make sure Use webhook is enabled for the channel. If the panel warns that no public base URL is available, fix the MEMOH_WEBHOOK_PUBLIC_BASE_URL / tunnel setup first.

Features Supported

• One-on-one chat: Users chat with the bot by adding the linked LINE Official Account as a friend.
• Inbound messages: Text, images, and files sent by the user. Images must be hosted by LINE itself (the normal case for photos sent from the app).
• Outbound messages: Text, plus PNG/JPEG images.
• Signature verification: Incoming webhooks are verified against your Channel Secret; events are deduplicated for 24 hours.

Limitations

• Private chats only. Group and multi-person room messages are ignored — inviting the bot into a LINE group has no effect.
• Inbound audio, video, stickers, and location messages are not processed.
• Outbound images must be publicly reachable over HTTPS and within LINE's size limits (10 MB original, 1 MB preview). Non-image attachments cannot be sent to LINE.
• Replies are delivered through the LINE Push API, so they count against your LINE plan's push message quota.
• Responses arrive as complete messages; LINE does not support incremental streaming output.
• Long replies are split into multiple messages at LINE's 5000-character limit.