public TwilioIntegration(TwilioIntegrationConfiguration configuration)
        {
            if (configuration == null)
            {
                throw new ArgumentNullException(nameof(configuration),
                    "Twilio Integration configuration has not been provided.");
            }

            _configuration = configuration;
        }
 /// <summary>
 /// Factory method for creating a new instance of TwilioIntegration.
 /// </summary>
 /// <param name="configuration">Configuration of Twilio integration.</param>
 /// <returns>Instance of TwilioIntegration.</returns>
 public static TwilioIntegration Create(TwilioIntegrationConfiguration configuration)
     => new TwilioIntegration(configuration);