> ## Documentation Index
> Fetch the complete documentation index at: https://docs.stardeck.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# LINE

> Connect a LINE Official Account so your apps can message customers on LINE—and react when customers message back.

LINE is a **two-way** channel: your apps can send messages to customers on LINE, and they can react when a customer sends a message in. You connect a LINE Official Account in your dashboard, then describe what you want and the agent builds it.

```mermaid theme={null}
flowchart LR
    Cust["💬 Customer on LINE"] -- "messages in" --> SD["☁️ Stardeck"]
    SD -- "forwards to your app" --> App["📱 Your app"]
    App -- "send message" --> SD
    SD -- "delivers on LINE" --> Cust
```

Your app never holds your LINE credentials—Stardeck brokers every message. See [Connected Services](/connected-services/overview) for the shared model.

## Testing vs. your own account

You can start sending right away on a **shared dev account**, then connect your own when you go live—similar to how [email](/email) works.

|                | Shared dev account                          | Your own LINE Official Account                                                                    |
| -------------- | ------------------------------------------- | ------------------------------------------------------------------------------------------------- |
| **Setup**      | None—available immediately                  | Connect in [Settings → Integrations](https://www.stardeck.ai/dashboard/settings?tab=integrations) |
| **Sends from** | A shared Stardeck dev account               | Your branded Official Account                                                                     |
| **Limit**      | 50 messages/day, **sandbox & preview only** | Your LINE plan's limits                                                                           |
| **Use for**    | Trying things out while you build           | Production                                                                                        |

Sending on the shared account is blocked once your app is live, so connect your own Official Account before going to production. See [Connect LINE](/connected-services/line/connecting).

## What you can build

Describe what you want in the project chat. Some examples:

**Message customers**

```
When an order ships, send the customer a LINE message with the tracking link
```

**React to incoming messages**

```
When someone messages our LINE account "hours", reply with our opening times
```

**Onboard new followers**

```
When a customer adds our LINE account, send them a welcome message and a coupon
```

You describe the outcome—the agent designs the flow and wires it up. See [Receiving messages](/connected-services/line/receiving-messages) for how inbound messages reach your app.

<Note>
  Want an AI agent to answer LINE messages automatically, instead of writing the replies in your
  app? Pair your LINE account to a [**Starcat Customer Agent**](/customer-agents/overview) that
  handles conversations for you and lets your team review or take over. (In early access—ask
  [support](mailto:support@stardeck.ai) if you don't see **Conversations** in your dashboard.)
</Note>

## Next steps

<CardGroup cols={2}>
  <Card title="Connect LINE" icon="plug" href="/connected-services/line/connecting">
    Link your LINE Official Account and grant it to your apps
  </Card>

  <Card title="Receiving messages" icon="inbox" href="/connected-services/line/receiving-messages">
    React when customers message your account
  </Card>

  <Card title="Connected Services" icon="link" href="/connected-services/overview">
    How linked accounts work across the platform
  </Card>

  <Card title="Email" icon="envelope" href="/email">
    Reach customers over email too
  </Card>
</CardGroup>