How to send SMS in C# using Unifonic?

        public static async Task UniFonicSendConfirmVisitSMSAsync(string mobile)
        {
            try
            {
                using (var httpClient = new HttpClient())
                {
                    var url = "https://el.cloud.unifonic.com/rest/SMS/messages";

                    var formContent = new FormUrlEncodedContent(new[]
                    {
                        new KeyValuePair<string, string>("AppSid", "******************"),
                        new KeyValuePair<string, string>("SenderID", "xxx"),
                        new KeyValuePair<string, string>("Body", "xxxxxxxxxxxxxxxxxxxxxx"),
                        new KeyValuePair<string, string>("Recipient", mobile),
                        new KeyValuePair<string, string>("responseType", "JSON"),
                        new KeyValuePair<string, string>("CorrelationID", UniqueID),
                        new KeyValuePair<string, string>("baseEncode", "true"),
                        new KeyValuePair<string, string>("MessageType", "6"),
                        new KeyValuePair<string, string>("statusCallback", "sent"),
                        new KeyValuePair<string, string>("async", "false")
                    });

                    var response = await httpClient.PostAsync(url, formContent);

                    if (response.IsSuccessStatusCode)
                    {
                        Console.WriteLine("SMS sent successfully.");
                    }
                    else
                    {
                        Console.WriteLine("Failed to send SMS.");
                    }
                }

            }
            catch
            {
                // $"Please enter a valid phone number. Current Phone number is {patient.mobile}.";
            }
        }