💬Send a single message using LINE User Id

This API is an additional paid item of the "Integration Suite Developer Kit" and is expected to be included in the charging mechanism during Q4 2025 to Q1 2026 period.

Sending messages using LINE User Id and line_account

When you need to send personalized messages to specific LINE users, you can use this API and integrate by using LINE User Id together with line_account to complete the integration. This integration method allows you to communicate more effectively with users under a specified account.

In addition, using this Push API can help you save time and resources because you don't need to build the message delivery and friend synchronization system from scratch.

With just a few simple steps, the system will automatically help you:

1. Check whether there is already corresponding user data

2. If not, verify via the LINE API whether they are a valid friend and create the data

3. Send the message immediately after completion

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API

Endpoint

curl -X POST
    -H "Content-Type: application/json"
    https://{API_HOST}/api/v1/***

{line_account} is the LINE official account ID within the system (path parameter).

Example (curl)

curl -X POST \
  -H "Content-Type: application/json" \
  -d '{
        "user_id": "U23f091df6743abee1122334455667788",
        "type": "text",
        "message": "This is a pushed message",
        "is_force": false
      }' \
  https://{API_HOST}/api/***

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Response

The return is in JSON format, and the HTTP status code 200indicates successful sending.

{}

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URL / Body Parameters

Path Parameter

Name	Type	Required	Description
line_account	int	Yes	LINE Account ID within the system

Body Parameters

Name	Type	Required	Description
user_id	string	Yes	LINE UserId. Fixed length 33, format U + 32 hex characters
type	string	Yes	Message type:text,image,carousel,image_carousel,carousel_for_products,button,quickreply
message	object / string	Yes	The content of the message type depending on
is_force	boolean	No	Whether to force send, even if currently in a conversation

---

Message field message format

Text message

{
  "type": "text",
  "message": "The text message to send"
}

(Other types such as image / carousel / button / quickreply can be expanded in the same style.)

---

System process description

1. Find existing data

   • Using {line_account} + user_id to check whether there is a corresponding contact.

   • If found → send the message directly using that contact.

2. If not found, verify friend via LINE API

   • Call the LINE official API to check whether the user_id is a {line_account} valid friend of

   • If verification fails → return an error (for example 400 / 422).

3. If verification passes, create the contact and send

   • Add the corresponding contact data in the system.

   • After creation is complete, immediately use the newly created contact to send the PUSH message.