Webhook payloads

$signature = hash_hmac('sha256', $payloadJsonString, $signingKey);

const crypto = require('crypto');
const signature = crypto
  .createHmac('sha256', signingKey)
  .update(payloadJsonString)
  .digest('hex');

import hmac
import hashlib
signature = hmac.new(
    signingKey.encode(),
    payloadJsonString.encode(),
    hashlib.sha256
).hexdigest()

using System.Security.Cryptography;
using System.Text;
var hmac = new HMACSHA256(Encoding.UTF8.GetBytes(signingKey));
var hash = hmac.ComputeHash(Encoding.UTF8.GetBytes(payloadJsonString));
var signature = BitConverter.ToString(hash).Replace("-", "").ToLower();

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
Mac mac = Mac.getInstance("HmacSHA256");
SecretKeySpec keySpec = new SecretKeySpec(
    signingKey.getBytes("UTF-8"), "HmacSHA256");
mac.init(keySpec);
byte[] hash = mac.doFinal(payloadJsonString.getBytes("UTF-8"));
StringBuilder sb = new StringBuilder();
for (byte b : hash) sb.append(String.format("%02x", b));
String signature = sb.toString();