FAQ entries tagged #LINE Login

Can I change the company name on the bottom of the profile page?

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.

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

How many channels can I create?

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

Where can I find my Channel ID?

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.
LINE Developers Console:

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

Where can I find my Provider ID?

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.

How do I report an issue about the LINE Platform?

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.

How can I get a user's phone number?

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).

Is it possible for the user IDs of users who have deleted their LINE accounts to be used again?

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?

Once a user ID is issued, can it be changed at any time?

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?

What are the user ID, group ID, room ID, and one-on-one chat 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}.

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]{128}.

Where can I check the status of LINE API outage?

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 (opens new window)

How does auto login work?

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 App Links (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.

Why do I get an NLChannelGatewayErrorDomain error when I try to use LINE Login in my application?

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

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