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문서Chat서버 APIsWebhooksOne-to-One Message WebhooksAfter a One-to-One Message Extension Is Configured

After a One-to-One Message Extension Is Configured

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마지막 업데이트 시간: 2026-01-04 17:37:38

Feature Overview

This webhook allows your app backend to monitor user message extension operations in one-to-one (C2C) chats in real-time.

Notes

To receive this webhook, you must configure the callback URL and turn on the corresponding switch. For detailed configuration steps, see Webhook Overview.
The Chat backend sends HTTPS POST requests to your app backend. After receiving a webhook request, verify that the SDKAppID parameter matches your application's SDKAppID. For additional security considerations, see Webhook Overview: Security Considerations.

Webhook Triggering Scenarios

This webhook is triggered when message extensions are set for one-to-one chats through either:
Client SDK: Users configure message extensions via the client.
REST API: Admins configure message extensions using the Set Message Extension.

Webhook Triggering Timing

The webhook fires after a C2C message extension is successfully set.

API Description

Sample Request URL

In the following example, the callback URL configured for the App is https://www.example.com.
Example:
https://www.example.com?SdkAppid=$SDKAppID&CallbackCommand=$CallbackCommand&contenttype=json&ClientIP=$ClientIP&OptPlatform=$OptPlatform

Request Parameters

Parameter
Description
HTTPS
The request protocol is HTTPS, and the request method is POST.
www.example.com
Callback URL.
SDKAppID
The SDKAppID assigned in the chat console when creating an application.
CallbackCommand
Fixed value: C2C.CallbackAfterC2CMsgExtension.
contenttype
The request body is fixed as JSON.
ClientIP
Client IP address (e.g., 127.0.0.1).
OptPlatform
Client platform. For the valid values, see the description of the OptPlatform parameter in Webhook Protocol.

Sample request

// Set Message Extension KV
{
  "CallbackCommand": "C2C.CallbackAfterC2CMsgExtension",
  "From_Account":"user1",
  "To_Account":"user2",
  "MsgKey":"93847636_1287657_1764688415",
  "OperateType":1,
  "ExtensionList":[
    {"Key":"k1","Value":"v1","Seq":1}, // Version number of a single KV
    {"Key":"k2","Value":"v2","Seq":1},
    {"Key":"k3","Value":"v3","Seq":1}
  ],
  "Seq":1,  // Represents the latest version number of the entire message
  "EventTime":1764688540182
}


// Delete message extensions KV
{
  "CallbackCommand": "C2C.CallbackAfterC2CMsgExtension", // Callback command
  "From_Account":"user1",
  "To_Account":"user2",
  "MsgKey":"93847636_1287657_1764688415",
  "OperateType":2,
  "ExtensionList":[
    {"Key":"k1","Value":"","Seq":2}, 
    {"Key":"k2","Value":"","Seq":2},
    {"Key":"k3","Value":"","Seq":2}
  ],
  "Seq":2, // Represents the latest version number of the entire message
  "EventTime":1764688641499
}

// Clear message extensions KV
{
  "CallbackCommand": "C2C.CallbackAfterC2CMsgExtension", // Callback command
  "From_Account":"user1",
  "To_Account":"user2",
  "MsgKey":"93847636_1287657_1764688415",
  "OperateType":3,
  "ExtensionList":[],
  "Seq":3, // Represents the latest version number of the entire message
  "EventTime":1764688662721
}

Request fields

Field
Type
Description
CallbackCommand
String
Callback command.
From_Account
String
UserID of the message sender.
To_Account
String
UserID of the message recipient.
MsgKey
String
Unique message identifier.
OperateType
Integer
1：Set message extension key-value(KV) pairs.
2：Delete message extension KV.
3：Clear all message extensions KV.
ExtensionList
Array
Message Extension KV pair.
Seq
Integer
Version number.
EventTime
Integer
Event trigger timestamp, in milliseconds.

Sample response

{
  "ActionStatus": "OK",
  "ErrorInfo": "",
  "ErrorCode": 0 // 0: callback successful; 1: callback error.
}

Response fields

Field
Type
Required
Description
ActionStatus
String
Required
Request processing result:
OK: Successfully processed.
FAIL: Processing failed.
ErrorCode
Integer
Required
Error Code:
0: Callback processed successfully.
1: Callback processing error.
ErrorInfo
String
Required
Error Message.

References

Webhook Overview
REST API: Set Message Extension
이전 주제: After a User Is Unfollowed다음 주제: Before a One-to-One Message Is Sent

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