Multichain
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Notify URL (Webhook)
Save a project webhook url to receive subwallet deposit callback/notifications.
Step 1: Select "Configure Webhook" from "Projects" on Dashboard.
Configure webhook
Step 2: Input your webhook URL into the field provided and click "Save"
Save your webhook callback url under "Projects"
Step 3: Send test notification to webhook url for development purposes.
"Send test notification" option

πŸ”” Sample notification POSTto your webhook url

{
"type": "DEPOSIT",
"network": "TRON",
"status": "SUCCESS",
"hash": "cd2df87daa2001c678f5be970851278987a45132f165f62e5f1e1987c43d5cf7",
"fromAddress": "TDmarSrhZg7LaUaQyzez7UA2EZrCLWXEjw",
"toAddress": "TTcVb5oLA7UDGCDvTs7DtQo9ktJWgYPCkC",
"contractAddress": "TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t",
"value": "787.41",
"assetName": "Tether USD",
"assetSymbol": "USDT",
"networkFee": "1",
"platformFee": "3.93705",
"timestamp": 1618564124
}
Go to https://webhook.site/ and use the given unique url to immediately inspect and test notifications sent by Multichain.
Step 4:
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Validating data received at callback URL (Webhook) It is considered standard practice to respond with 200 OK once you have successfully received a webhook callback (notification).
Javascript
Python
function isValidSignature(request) {
const secretKey = 'Secret Key provided by Multichain on the Project (View Key) list popup';
const headers = request.headers;
const signature = headers['multichain-api-key']; // Lowercase for NodeJS
const body = request.body;
const hmac = crypto.createHmac('sha256', secretKey) // Create a HMAC SHA256 hash using the auth token
hmac.update(body, 'utf8') // Update the token hash with the request body using utf8
const digest = hmac.digest('hex');
return (signature === digest); // If signature equals your computed hash, return true
}
import hmac
import hashlib
import json
def isValidSignature(request):
secretKey = '<your Secret Key goes here>';
headers = request['headers'];
signature = headers['multichain-api-key'];
body = request['body'];
string_body = json.dumps(body, separators=(',', ':'))
digest = hmac.new(
bytes(secretKey, 'utf-8'),
msg=bytes(string_body, 'utf-8'),
digestmod=hashlib.sha256
).hexdigest()
return (signature == digest);
Make sure only to store validated transactions by type DEPOSIT using hash as the unique - primary key which will reject and prevent duplicated deposits in any case where your system receives a repeated webhook notification.
Note that webhook notification max retry is
5
times; Notification will stop if no 200 OK response from your application is received within the retries.
πŸ””
You may however manually re-send the notification from the user dashboard under the "Subwallet Deposits" tab. (Image reference below.)
Re-send webhook notification to your application manually.
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