var body = JsonSerializer.Serialize(webhookEvent.EventData, new() { PropertyNamingPolicy = JsonNamingPolicy.CamelCase });
var secretBytes = Encoding.UTF8.GetBytes(secret);
using var hasher = new HMACSHA256(secretBytes);
var data = Encoding.UTF8.GetBytes(body);
var signatureBytes = hasher.ComputeHash(data); 
return Convert.ToBase64String(signatureBytes);