FAQ entries tagged #LIFF

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

To report a problem encountered on the LINE Platform or make a request for improvement, contact us using the help center's Inquiry form. 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.

In the LIFF browser and LINE's in-app browser, the user's social login with google account isn't allowed. This is because Google's OAuth 2.0 Policies disallow authorization requests from WebView to Google.

Therefore, when the user tries social login with google account in the LIFF browser or LINE's in-app browser, an error with a status code 403 and an error code disallowed_useragent will be displayed.

In the LIFF browser and LINE's in-app browser, if there is a problem with the SSL/TLS certificate on a network path, an error may occur and you may not be able to open the page. The following are examples of the error message that appears when the page doesn't open:

• This connection isn't private
• Unable to process your request due to a temporary error. Please try again.
• An unknown error occurred. Please try again later.
• Unable to open page. Server not found.
• This site is potentially unsafe. Please close this screen.

Note that even if there is no problem with the certificate of an accessed page, you may receive an error message if there is a certificate problem when loading external resources contained on the page. For example, if you specify a path on a server with a certificate problem in the src attribute of a <script> element as shown below, you may receive an error message.

<script charset="utf-8" src="{A path on a server with a certificate problem}"></script>

In some cases, when you access a LIFF URL on an external browser such as Safari or Chrome, universal links or app links may not work and the LIFF browser may not open on the LINE app. This depends on the specifications of the user's OS. In addition, when accessing a LIFF URL on a native app other than the LINE app, whether the LIFF app is opened in the external browser or the LIFF browser depends on the WebView specifications of the native app.

For these reasons, we don't guarantee in which environment the LIFF app will open when the LIFF URL is accessed.

For more information, see Environment where the LIFF app opens when a user access the LIFF URL in the LIFF documentation.

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.

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, and room ID values?

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 used for group chats and the room ID used for multi-person chats are values generated by the LINE Platform to identify group chats and multi-person chats.

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}.

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, and room ID values?

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

• Outage report in the news section of the LINE Developers site
• LINE API Status

If additional information such as paths, query parameters, or URL fragments are provided to the LIFF URL accessed by the user, all additional information is passed to the redirected URL.

The following is an example when the endpoint URL is https://example.com/ and the LIFF URL has /path1/?campaign=campaign1#section-2 as additional information:

For more information, see Behaviors from accessing the LIFF URL to opening the LIFF app.

See The differences between the LIFF browser and external browser in the LIFF documentation.