Check if you have included "http://" or "https://" in the URL. The link must be in the same URL format as used on browsers.
Message actions will work normally when added to the chat in Chats mode.
The actual LINE chatbot only accepts URLs starting with "https://" to ensure security. LINE Bot Designer doesn't have this limitation to encourage the creation of any chatbot prototype.
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.
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.
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).
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.
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.
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.
The behavior of converting a URL in a text message to a link depends on the specifications of the OS, such as Android or iOS, and this isn't controlled by the LINE app. For this reason, a URL in a text message may not become a link.
Note that adding a space or a line break before the URL in the text message may be recognized as a valid URL.
You can determine with a follow event and an unfollow event of webhook events. There is no endpoint to determine if a user is a friend of your LINE Official Account.
When the person to whom the LINE Official Account was referred adds them as a friend or unblocks them, a webhook follow event is sent from the LINE Platform to the bot server. However, you can't use the Messaging API to confirm how the user added the LINE Official Account as a friend (i.e., whether the user added the LINE Official Account as a friend through someone's referral).
It is also not possible to confirm the number of people who have friended the LINE Official Account as a result of friend referrals.
You can't use the Messaging API to verify that a message you sent was read. You can get statistics about your sent messages on the following endpoints:
Using the Messaging API, you can send only the stickers listed in the Stickers.
You can send other stickers using the following methods:
You can send stickers that you own with your LINE account. To send your own stickers, go to "Chats" in the LINE Official Account Manager(opens new window) or the LINE Official Account Manager App. For more information, see Chats(opens new window) (only available in Japanese) in LINE for Business.
Only corporate users who have submitted the required applications can send stickers owned by the company such as sponsored stickers or creators' stickers. To send these stickers from your LINE Official Account, contact your sales representative or contact our Sales partners(opens new window).
Once you've linked your LINE Official Account to a Messaging API channel, you can't un-link your LINE Official Account from the Messaging API channel.
If you want to continue using your LINE Official Account linked to the Messaging API channel, but want to stop using the Messaging API, see Stop using the Messaging API in the Messaging API documentation.
Messages sent using the Messaging API may take some time to reach the user.
Messaging requests to each endpoint of the Messaging API are processed asynchronously. For this reason, if a LINE Official Account has many friends, or if there are a large number of requests from other LINE Official Accounts at the same time, it may take some time for the message sending process to be completed.
No, reply messages are not counted towards the message count.
In LINE Official Accounts and the Messaging API, there are various messaging features, but not all message deliveries are counted as part of the message count. Some message deliveries, such as chats and auto-response messages in the LINE Official Account Manager, can be used for free.
Sending methods that are counted towards the message count
Message delivery in the LINE Official Account Manager (including targeted broadcasts and step messages)
Push messages, multicast messages, broadcast messages, and narrowcast messages in the Messaging API
Sending methods that are not counted towards the message count
Chats, auto-response messages, and greeting messages in the LINE Official Account Manager
Reply messages in the Messaging API
For more information on sending methods that are counted towards the message count, see Chargeable Messages(opens new window) (only available in Japanese) in LINE for Business.
By checking the value of the Content-Type header, you can find out the file format of the content. Examples of file format indicated by the Content-Type header are as follows:
If you sent a message via the Messaging API and received a status code 2xx, but the user didn't receive the message, the possible reasons are as follows:
The conditions required for sending a message aren't met, e.g. the user has blocked your LINE Official Account.
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.
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.
No, the IP address of the LINE Platform from which the webhook request is sent isn't disclosed. For better security, use signature validation instead of access control by IP address.
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 group chat or multi-person chat 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.
Characters in a text are counted in UTF-16 code units (16-bit). Characters expressed in multiple code units, such as some kanji characters and Unicode emojis, are counted as multiple characters instead of one character.
Also, unlike Unicode emojis, LINE emojis provided by LINE are internally converted to the alternative text (e.g., (love)), so they're counted by the number of characters in the alternative text.
Examples of counting the number of characters in UTF-16 code units are as follows:
The order in which messages are displayed depends on how the messages are sent.
If endpoints used for sending messages are executed multiple times, the order in which the endpoints are executed and the order in which the messages will be displayed won't be necessarily the same.
If an endpoint for sending messages is executed once and multiple messages are specified in the request body, the messages will be displayed in the order specified in the request body.
Even if a message that contains a video is successfully sent, the video may not play properly on the user's device. If the video doesn't play properly, confirm the following:
The video must be in a playable file format (mp4).
The file size of the video must be 200 MB or less.
The codec, profile, and level of the video must be set appropriately. *
* If the video doesn't play properly on a particular device, you should take steps such as setting the video codec, profile, and level appropriately. The video might play if you set the video to a setting that is easier for the device to process.
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.
It's possible that Allow bot to join group chats setting is disabled on your LINE Official Account, or that another LINE Official Account has already joined the group chat or multi-person chat you invited.
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:
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.
If Chat is set to On, depending on the Chat response method setting, it may automatically send replies.
In this case, if a default rich menu has been set, the default rich menu will be displayed on the user's screen instead. If no default rich menu has been set, the rich menu itself won't be displayed.
There are several reasons why the intended rich menu may not be displayed:
A rich menu with a higher display priority has been already set
Rich menus are displayed based on their display priority, not the set date and time. For example, suppose you have set a per-user rich menu. If you then set a default rich menu, the per-user rich menu will be displayed because it has a higher priority than the default rich menu.
If the developer deletes a per-user rich menu, that rich menu will no longer be displayed.
If a default rich menu is set, the default rich menu will be displayed instead. If no default rich menu has been set, the rich menu itself won't be displayed.
No, you can't set multiple bot server endpoints in the webhook URL. Only one bot server endpoint can be set in the webhook URL per Messaging API channel.
