Reply

From

Acme Store (@acmestore)

To

Yui Tanaka

Message

Yes, Shibuya is open 10:00 to 20:00 on Sunday
Send

Yui Tanaka

Today
Is the Shibuya store open on Sunday?
Yes, Shibuya is open 10:00 to 20:00 on Sunday

LINE API for products and agents

Read and answer your LINE Official Account chats from your own product, with the same Zernio API you use for WhatsApp, iMessage and social.

Start for freeRead the docs
  • SOC 2
  • GDPR compliant
  • 99.97% uptime
  • Under 50ms response

Join 200,000+ of the world's most ambitious developers and builders

Warner Music Group
Runable
ClickUp
MoFlo
RE/MAX
Readdy

Why Zernio?

Everything between you and your first message, handled

Zernio API

  • Webhook set for you

    Paste the Channel ID and secret, Zernio points LINE at the right URL

  • Free replies first

    The reply token is used while it is valid, push only after it expires

  • Media kept

    Images, video, audio and files are stored before LINE's links expire

  • One API for every channel

    Same inbox, broadcasts and webhooks as WhatsApp and social

Building it yourself

  • A webhook server to run

    Signature checks, retries and an endpoint that never sleeps

  • Reply tokens that expire

    Miss them and every reply counts toward your quota

  • Content that disappears

    Download every image and file before LINE drops it

  • No inbox

    You build the UI, contacts and history yourself

How It Works

From zero to first LINE reply in minutes

1

Connect LINE

Channel ID

2006751234

Channel secret

••••••••••••c41a

Webhook set

Paste two keys

Enable the Messaging API in LINE Official Account Manager and copy the Channel ID and Channel secret. Zernio sets the webhook.

2

Response settings

Webhooks

Off

Auto-response messages

On

Flip two switches

In LINE Official Account Manager, turn on Webhooks and turn off auto-response.

3

Conversations

Òscar

+34 634 44 21 23

All works!

Whatsapp Bus...

+34 639 32 11 23

Hey, i have a question...

Every chat in one inbox

LINE chats land next to your WhatsApp, iMessage and social DMs, ready to answer.

LINE Messaging API

Everything your LINE account receives, in your product

Conversations

Yui Tanaka

Is the Shibuya store open on Sunday?

Marta Ruiz

Can I change the size?

Jonas Weber

Thanks, got it!

Unified inbox

Text, images, video, audio, files, stickers and locations, next to every other channel.

Is the blue one in M?
Yes, 3 left in Shibuya
Sent with reply token · free

Replies

Answer with text or media. Zernio picks the free reply token or a push for you.

Sunday sale

Sent

20% off everything in store this Sunday only 🛍️

1,240 LINE contacts

Broadcasts

Send one message to a list of LINE contacts from the API or the dashboard.

When a message contains

"opening hours"

Reply with

We're open 10:00 to 20:00, every day

Automations

Keyword replies and automations run on LINE chats like on every other channel.

Stores
Hours
Orders
Coupons
Sizes
Help
postback · action=hours

Button taps

Rich menu and button taps (postbacks) arrive in the conversation, so you can answer them.

POST /webhooks/zernio

{

"event": "message.received"

"platform": "line"

"from": "Yui Tanaka"

"text": "Open on Sunday?"

}

Webhooks

Get message.received on your server for every new LINE message, in the same shape as every channel.

Integrate

Let an agent run LINE end to end

Every step runs through Zernio's MCP server, so an AI agent can read LINE chats and draft replies without anyone opening the dashboard.

› claude

Claude Code v2.1.19

Opus 4.5 · Claude Max

~/software

›

✓ registered · https://mcp.zernio.com/mcp

✓ signed in over OAuth · no key pasted

✓ call_tool · read 6 LINE chats

✓ 6 replies drafted · nothing sent yet

Build it yourself with 8 SDKs or the CLI

Read and answer LINE chats with one REST call from Node, Python, Go, Ruby, Java, PHP, .NET, or Rust, or script it from the terminal with the Zernio CLI.

Read the docs
import Zernio from '@zernio/node';
const zernio = new Zernio(); // reads ZERNIO_API_KEY
 
const { data } = await zernio.messages.sendInboxMessage({
  path: { conversationId: 'conv_3c1d' },
  body: { accountId: 'acc_8f2a', message: 'Yes, Shibuya is open 10:00 to 20:00 on Sunday' },
});
  • Node
  • Python
  • Go
  • Ruby
  • Java
  • PHP
  • .NET
  • Rust
Pricing

Messages on one meter

A LINE account counts as one connected account on your plan. The messages you send share the message allowance with every other channel.

See pricing

After 10,000 free a month

$1

Per 10,000 messages sent

Messages received

Free

LINE message quota

Billed by LINE

Frequently Asked Questions

Ship LINE today

No credit card, no sales call. Connect your LINE Official Account and start replying today.

Start for free
  • SOC 2
  • GDPR compliant
  • 99.97% uptime
  • Under 50ms response