如何通过UnificationEngine(UE)利用已有Line连接发送消息？

Hey there! Since you've already set up a user and linked Line via Unification Engine (UE), sending messages through that connection is straightforward. Here's a step-by-step breakdown to get you going:

First, make sure you have these details ready (you can find most of them in your UE dashboard or via API responses from your setup steps):

• Your UE user_id (the unique ID for the user you created)
• The connection_id for your Line integration (assigned when you added the Line link to your UE user)
• Your UE API access token (located in your UE account settings under API credentials)

UE uses a standardized JSON payload that works across all supported channels. For Line, here's a basic example of what your payload should look like:

{
  "user_id": "YOUR_UE_USER_ID",
  "connection_id": "YOUR_LINE_CONNECTION_ID",
  "message": {
    "text": "Hey there! This message is sent via Unification Engine to Line."
  },
  "to": {
    "line": {
      "user_id": "TARGET_LINE_USER_ID" // Replace with the recipient's Line user ID
    }
  }
}

• Want to send rich content? Line supports stickers, images, and more. Here's a quick example for a sticker:

  "message": {
    "sticker": {
      "package_id": "1",
      "sticker_id": "100"
    }
  }
  

• If sending to a Line group, swap user_id in the to.line object with group_id and use the group's unique ID instead.

Use a POST request to UE's message endpoint. Here's how to do it with curl:

curl -X POST \
  https://api.unificationengine.com/v1/messages \
  -H 'Authorization: Bearer YOUR_UE_API_TOKEN' \
  -H 'Content-Type: application/json' \
  -d '{
    "user_id": "YOUR_UE_USER_ID",
    "connection_id": "YOUR_LINE_CONNECTION_ID",
    "message": {
      "text": "Hello from UE!"
    },
    "to": {
      "line": {
        "user_id": "TARGET_LINE_USER_ID"
      }
    }
  }'

• For programming languages, use their native HTTP libraries. Here's a Python example with requests:

import requests

url = "https://api.unificationengine.com/v1/messages"
headers = {
    "Authorization": "Bearer YOUR_UE_API_TOKEN",
    "Content-Type": "application/json"
}
payload = {
    "user_id": "YOUR_UE_USER_ID",
    "connection_id": "YOUR_LINE_CONNECTION_ID",
    "message": {"text": "Hello from UE!"},
    "to": {"line": {"user_id": "TARGET_LINE_USER_ID"}}
}

response = requests.post(url, json=payload)
print(response.json())

UE will return a JSON response to confirm success or flag errors. A successful response looks like this:

{
  "status": "success",
  "message_id": "UE_GENERATED_MESSAGE_ID"
}

• If you get an error, the response will include details to troubleshoot—common issues include invalid credentials, incorrect target IDs, or missing required fields in the payload.

内容的提问来源于stack exchange，提问作者Bernad Vicky