curl -i -X POST \
  'https://api.portal.io/public/webhook/subscription/42' \
  -H 'Accept: application/json' \
  -H 'Content-Type: application/x-www-form-urlencoded' \
  -H 'X-MSS-API-APPID: YOUR_APP_ID' \
  -H 'X-MSS-API-USERKEY: YOUR_USER_KEY' \
  -H 'X-MSS-CUSTOM-DATE: Mon, 06 Apr 2026 00:22:19 GMT' \
  -H 'X-MSS-SIGNATURE: BASE64_SIGNATURE' \
  -d 'Url=https%3A%2F%2Fapp.example.com%2Fwebhooks%2Fportal-v2' \
  -d 'Enabled=true' \
  -d 'Events=proposal.status_changed' \
  -d 'Events=proposal.build.status_update' \
  -d 'Events=proposal.outline.status_update'

import requests
from portal_auth import sign_request

url = "https://api.portal.io/public/webhook/subscription/42"
timestamp = "Mon, 06 Apr 2026 00:22:19 GMT"
content_type = "application/x-www-form-urlencoded"
signature = sign_request("POST", url, content_type, timestamp, "YOUR_USER_KEY", "YOUR_SECRET_KEY")

response = requests.post(url, headers={
    "Accept": "application/json",
    "Content-Type": content_type,
    "X-MSS-API-APPID": "YOUR_APP_ID",
    "X-MSS-API-USERKEY": "YOUR_USER_KEY",
    "X-MSS-CUSTOM-DATE": timestamp,
    "X-MSS-SIGNATURE": signature
}, data=[
    ("Url", "https://app.example.com/webhooks/portal-v2"),
    ("Enabled", "true"),
    ("Events", "proposal.status_changed"),
    ("Events", "proposal.build.status_update"),
    ("Events", "proposal.outline.status_update"),
])
print(response.json())

const { signRequest } = require('./portalAuth');

const url = "https://api.portal.io/public/webhook/subscription/42";
const timestamp = new Date().toUTCString();
const contentType = "application/x-www-form-urlencoded";
const signature = signRequest("POST", url, contentType, timestamp, "YOUR_USER_KEY", "YOUR_SECRET_KEY");

const response = await fetch(url, {
    method: "POST",
    headers: {
        "Accept": "application/json",
        "Content-Type": contentType,
        "X-MSS-API-APPID": "YOUR_APP_ID",
        "X-MSS-API-USERKEY": "YOUR_USER_KEY",
        "X-MSS-CUSTOM-DATE": timestamp,
        "X-MSS-SIGNATURE": signature
    },
    body: new URLSearchParams([
        ["Url", "https://app.example.com/webhooks/portal-v2"],
        ["Enabled", "true"],
        ["Events", "proposal.status_changed"],
        ["Events", "proposal.build.status_update"],
        ["Events", "proposal.outline.status_update"],
    ])
});
const data = await response.json();
console.log(data);

{
  "subscriptionId": 42,
  "url": "https://app.example.com/webhooks/portal-v2",
  "description": "Production webhook",
  "enabled": true,
  "secretKey": "whsec_a1b2c3d4e5f6...",
  "events": [
    "proposal.status_changed",
    "proposal.build.status_update",
    "proposal.outline.status_update"
  ]
}