private bool PayloadMatches(string signature, string payload)
 {
     var sha1Hasher = new Sha1Hasher();
     string computedSignature = sha1Hasher.HmacHash(service.PrivateKey, payload).ToLower();
     var crypto = new Crypto();
     return crypto.SecureCompare (computedSignature, signature);
 }
        private bool PayloadMatches(string signature, string payload)
        {
            var    sha1Hasher        = new Sha1Hasher();
            string computedSignature = sha1Hasher.HmacHash(service.PrivateKey, payload).ToLower();
            var    crypto            = new Crypto();

            return(crypto.SecureCompare(computedSignature, signature));
        }