# FAQ

The company name displayed on the bottom of the profile page is your Provider name. You can change your Provider name by following these steps:

  • For Certified providers (Certified providers have a certified provider badge before their company name)

    You need to submit an application to LINE, so contact your sales representative.

  • For non-Certified providers

    From the LINE Developers Console, select provider, click Settings, and from the Provider settings, and click the Edit button under Provider name.

    Provider name edit

*It will take some time before the change of provider name is reflected on your profile page.

To delete the bot, you need to delete your LINE Official Account.

See The number of channels that can be created in the LINE Developers Console documentation.

You can find your Channel ID on the LINE Official Account Manager (opens new window) or the LINE Developers Console.

  • LINE Official Account Manager (requires Admin role):

    Select account from accounts list and click Settings in the top-right corner of the page. Click Messaging API from the side menu, and you will see your Channel ID next to Channel Info.

    OAM settings

  • LINE Developers Console:

    From the LINE Developers Console, select provider, and then select channel. You can find your Channel ID under Basic settings.

    Console settings

You can find your Provider ID on the LINE Developers Console.

  • If you have Provider Admin role:

    From the LINE Developers Console, select provider and then click Settings. You can find your Provider ID under Provider settings.

    Provider ID Admin

  • If you don't have Provider Admin role:

    From the LINE Developers Console, select provider. From the page displayed, you will see your Provider ID in the segment after /provider/ in the URL.

    Provider ID URL

Your account may not have been set up to allow webhooks. To allow webhooks, enable Use webhook on the Messaging API tab of your channel settings on the LINE Developers Console.

Depending response settings on the LINE Official Account Manager, the LINE Official Account will automatically send replies.

Click Edit in Auto-reply messages on the Messaging API tab of your channel settings on the LINE Developers Console to access LINE Official Account Manager and check Response setting.

LINE Official Account will automatically send replies in these cases:

  • When Response mode is set to Bot

    • If Greeting message is set to Enabled, it will automatically send replies when user adds your LINE Official Account as a friend.
    • If Auto-response is set to Enabled, it will automatically send replies according to the preset conditions.
  • When Response mode is set to Chat

    • If Greeting message is set to Enabled, it will automatically send replies when user adds your LINE Official Account as a friend.
    • Depending on the Detailed settings setting, it may automatically send replies.

It's not currently possible to get the name and profile image of a group.

There is no technical support desk for individual developers. See Documentation for information on the development process and specifications of the LINE APIs. For questions and advice regarding development, see the voluntary Q&A (opens new window) in the LINE Developers Community.

If you are a corporate customer and need technical support for LINE APIs, contact our Technology Partners (opens new window) for technical support. Any inquiry regarding the LINE APIs should be through our Technology partners.

To report a problem encountered on the LINE platform or make a request for improvement, contact us using the help center's Inquiry form (opens new window). Note that we may not be able to respond to all inquiries.

If you need technical support, see How do I contact technical support for inquiring about LINE APIs? in the FAQ.

Auto login can be used in these situations. You don't need to perform any special configurations when implementing LINE Login into your web app to use Auto login.

  • iOS

    • Auto login can be used when accessing a web app where LINE Login v2.0 or v2.1 is implemented using LINE's in-app browser or the Safari browser.
  • Android

    • Auto login can be used when accessing a web app where LINE Login v2.0 or v2.1 is implemented using LINE's in-app browser or external browsers such as Chrome.

Auto login isn't supported for devices other than iOS and Android devices, devices where LINE isn't installed, and in browsers other than the Safari browser for iOS.

Also, we use iOS's Universal links (opens new window) and Android's Common intents (opens new window) features to perform auto login on external browsers. Check the official documentation for each OS for information on concepts such as how the dialog is displayed when using these features, the OS requirements for using these features, and how to disable these features.

For more information, see Auto login in the LINE Login documentation.

About automatic login from the Yahoo! JAPAN app

Auto login is enabled when accessing a web app that incorporates LINE Login with PKCE implementation from the Yahoo! Japan app. For more information on PKCE support for LINE Login, see PKCE support for LINE Login in the LINE Login documentation.

About the user ID issued by a certain provider, in the case that the corresponding LINE account is deleted, the same user ID won't be reused for other LINE accounts within the provider.

For more information on user IDs, see What are the user ID, group ID, room ID, and one-on-one chat ID values?

User IDs are issued by each channel provider. Once a user ID (userId) is issued for a specific provider, it won't change unless the user deletes their LINE account.

The user ID won't change even if the user transfers their LINE account to another device.

If a user deletes their LINE account and then re-creates a LINE account with the same phone number, the user ID will change.

For more information on user IDs, see What are the user ID, group ID, room ID, and one-on-one chat ID values?

We don't disclose IP addresses.

We prevent unauthorized requests through SSL communication and Verifying signatures included in the webhook.

The user ID used by the LINE Platform identifies a user and has the following characteristics:

  • The value is generated by the LINE Platform, not by a user. This is different from the LINE ID on LINE used to search for friends.

  • Different user IDs are generated based on the provider of the channel. As long as channels have the same provider, regardless of whether the channel is for LINE Login or Messaging API, the same user ID is used for the users of the channels.

  • The user ID value is a string that matches the regular expression, U[0-9a-f]{32}.

The group ID and room ID used for group chats are values generated by the LINE Platform to identify groups and rooms.

The group ID is a string that matches the regular expression, C[0-9a-f]{32}, and the room ID is a string that matches the regular expression, R[0-9a-f]{32}.

In a LINE Front-end Framework (LIFF) app, the one-on-one chat ID (utou ID) is used to identify a one-on-one chat in addition to the three types of IDs mentioned above.

The one-on-one chat ID value is a string that matches the regular expression, UU[0-9a-f]{130}.

You can check the current status of a LINE API outage using these methods:

The iPad that created the LINE account or the iPad that took over the LINE account can display rich menus.

Other iPads can't display rich menus.

You can check the LINE settings screen to see if your iPad can display rich menus.

  • If Delete Account appears in Settings > Accounts, the iPad can display rich menus.

  • If Logout appears in Settings > Accounts, the iPad can't display rich menus.

NLChannelGatewayErrorDomain errors (for example, NLChannelGatewayErrorDomain Error 102) can occur if there are incorrect or missing settings in the LINE Developers Console.

If your iOS application is getting this error, confirm the following items:

  • The iOS bundle ID is registered on the LINE Login tab of your channel settings on the LINE Developers Console
  • The iOS universal link is registered on the LINE Login tab of your channel settings on the LINE Developers Console
  • The LINE account that you are using to log in with is registered in the Roles section of the LINE Developers Console

General LINE SDK users cannot use restricted API resources such as Graph and User Message APIs. Currently those resources are LINE internal use only.

You can download the LINE SDK from the following links:

LINE uses Open Graph Protocol tags from websites to generate URL previews.

The three OGP tags used by LINE:

# Open Graph Protocol tag Example
1 og:title <meta property="og:title" content="LINE : Free Calls & Messages">
2 og:description <meta property="og:description" content="LINE is a new communication app">
3 og:image <meta property="og:image" content="http://static.naver.jp/line_lp/img/ogp.png">

Example of URL preview:

URL preview in chat

OGP configuration

Even if you don't configure OGP tags, any text or image within the URL will be automatically retrieved to generate a URL preview.

For example, for the Title, if there is no available information in og:title, the text within the title tag will be displayed. Likewise, for the Summary, if there is no available information in og:description, the text within either the description tag or the body will be displayed (If there is no retrievable information, nothing will be displayed in the preview).

LINE uses only the three OGP tags listed above. URL previews will not include information contained in any other OGP tags.

Tip

A cache-deletion tool (opens new window) for deleting the LINE server side cache of your URL preview is now available.

End users can't save on Keep or forward videos sent from a LINE Official Account.

If you send a message specifying a user who has blocked the LINE Official Account or a user who deleted their account, no error will occur and status code 200 will be returned as a response.

In this case, no message will be sent to the user.

If a message is sent to a user ID that doesn't exist, this error will be returned with status code 400.

"message": "Failed to send messages"

Note that the user ID is a value issued for each provider. If you send a message with a user ID issued by another provider, it will be treated as if you sent the message to a user ID that doesn't exist.

For more information on user IDs, see What are the user ID, group ID, room ID, and one-on-one chat ID values?

The character count in a text message depends on the character type.

  • Alphabet/full-width characters: 1 character

  • Line break characters: 1 character per line break character (\n: 1 character, \r\n: 2 characters)

  • Emojis defined by Unicode and LINE

    • Emojis in Basic Multilingual Plane (for example, ☎): 1 character

    • Emojis on the supplementary plane that are represented using surrogate pairs: 2 characters

      This includes emojis defined by LINE and Unicode.

If you specify a user who doesn't actually receive the message, such as a user ID that blocked the LINE Official Account or a user ID that doesn't exist, the message won't be counted even if you call the API for sending the message.

The number of messages is counted by the number of people to whom the message was sent. In this example, if there are five people in the chat room or group where you sent the message, the number of messages counted is five. The number of message objects specified in a single request doesn't affect the number of messages sent.

For message count when you send a message to a user who doesn't receive the message, see If I send a message to a user who doesn't receive the message, is it still counted as one message?.

For more information on pricing, see Messaging API pricing.

Yes.

If multiple message objects are set in the request body when sending a message, the messages will be delivered in the order they are set from the top.

Message IDs are assigned a value that is unique throughout the Messaging API environment.

It doesn't mean that it's unique for each channel or message type, such as an image.

In Windows 10, you cannot use the curl command.

This page explains how to contact the REST API in PowerShell using Invoke-WebRequest.

# When a request body is required

When using an API that requires a request body, such as when creating LINE Things trial product information, enter the commands as shown below.

$channel_access_token = "{channel access token}"
$liffId = "{LIFF APP ID}"
$body = @{
 name = "{trial product name}";
 liffId = $liffId
} | ConvertTo-Json
$body = [System.Text.Encoding]::UTF8.GetBytes($body)
$response = Invoke-WebRequest -Method POST https://api.line.me/things/v1/trial/products `
-Headers @{
  "Authorization" = "Bearer " + $channel_access_token;
  "Content-Type" = "application/json"
} `
-Body $body
$response.Content

# When a request body is not required

When using an API that does not require a request body, such as when retrieving LINE Things trial product information, enter the commands as shown below.

$channel_access_token = "{channel access token}"
$response = Invoke-WebRequest -Method GET https://api.line.me/things/v1/trial/products `
-Headers @{
  "Authorization" = "Bearer " + $channel_access_token
} `
$response.Content

In Chats mode, click on a rich menu from the Rich Menu pane located on the bottom right to activate it.

You can use LINE Profile+ to get a user's phone number. For more information, see LINE Profile+ scopes in the Options for corporate customers documentation.

LINE Profile+ is only available to corporate users who have completed certain applications. If you wish you use LINE Profile+, contact your sales representative or contact our Sales partners (opens new window).