curl -i -X POST \
  'https://api.portal.io/public/proposals/123/contact/456' \
  -H 'Accept: application/json' \
  -H 'Content-Type: application/json' \
  -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 '{"proposalId": 123, "contactId": 456}'

import requests
from portal_auth import sign_request

url = "https://api.portal.io/public/proposals/123/contact/456"
timestamp = "Mon, 06 Apr 2026 00:22:19 GMT"
content_type = "application/json"
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
}, json={"proposalId": 123, "contactId": 456})
print(response.status_code)  # 200 OK on success

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

const url = "https://api.portal.io/public/proposals/123/contact/456";
const timestamp = new Date().toUTCString();
const contentType = "application/json";
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: JSON.stringify({ proposalId: 123, contactId: 456 })
});
console.log(response.status);  // 200 OK on success

Empty response body.