WebHook Example Script

Create a script with the following content and provide its URL as WebHook.

define("API_KEY", "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");

try {
    if (isset($_SERVER["HTTP_X_SG_SIGNATURE"])) {
        $hash = base64_encode(hash_hmac('sha256', $_POST["messages"], API_KEY, true));
        if ($hash === $_SERVER["HTTP_X_SG_SIGNATURE"]) {
            $messages = json_decode($_POST["messages"], true);

            /**
             * For example :-
             * $messages = [
             *                 0 => [
             *                          "ID" => "1",
             *                          "number" => "+911234567890",
             *                          "message" => "This is a test message.",
             *                          "deviceID" => "1",
             *                          "simSlot" => "0",
             *                          "userID" => "1",
             *                          "status" => "Received",
             *                          "sentDate" => "2018-10-20T00:00:00+02:00",
             *                          "deliveredDate" => "2018-10-20T00:00:00+02:00"
             *                          "groupID" => null
             *                      ]
             *             ]
             *
             * senDate represents the date and time when the message was received on the device.
             * deliveredDate represents the date and time when the message was received by the server.
             */

            foreach ($messages as $message) {
                if(strtolower($message["message"]) === "hi") {
                    // Reply to message using API or execute some commands. Possibilities are limitless.
                }
            }
        } else {
            http_response_code(401);
            error_log("Signature don't match!");
        }
    } else {
        http_response_code(400);
        error_log("Signature not found!");
    }
} catch (Exception $e) {
    error_log($e->getMessage());
}

PHP Integration

Include following code in your PHP file to start sending messages.

define("SERVER", "https://sms.sendapp.live");
define("API_KEY", "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");

define("USE_SPECIFIED", 0);
define("USE_ALL_DEVICES", 1);
define("USE_ALL_SIMS", 2);

/**
 * @param string     $number   The mobile number where you want to send message.
 * @param string     $message  The message you want to send..
 * @param int|string $device   The ID of a device you want to use to send this message.
 * @param int        $schedule Set it to timestamp when you want to send this message.
 *
 * @return array     Returns The array containing information about the message.
 * @throws Exception If there is an error while sending a message.
 */
function sendSingleMessage($number, $message, $device = 0, $schedule = null)
{
    $url = SERVER . "/services/send.php";
    $postData = array('number' => $number, 'message' => $message, 'schedule' => $schedule, 'key' => API_KEY, 'devices' => $device);
    return sendRequest($url, $postData)["messages"][0];
}

/**
 * @param array $messages        The array containing numbers and messages.
 * @param int   $option          Set this to USE_SPECIFIED if you want to use devices and SIMs specified in devices argument.
 *                               Set this to USE_ALL_DEVICES if you want to use all available devices and their default SIM to send messages.
 *                               Set this to USE_ALL_SIMS if you want to use all available devices and all their SIMs to send messages.
 * @param array $devices         The array of ID of devices you want to use to send these messages.
 * @param int   $schedule        Set it to timestamp when you want to send these messages.
 * @param bool  $useRandomDevice Set it to true if you want to send messages using only one random device from selected devices.
 *
 * @return array     Returns The array containing messages.
 *                   For example :-
 *                   [
 *                      0 => [
 *                              "ID" => "1",
 *                              "number" => "+911234567890",
 *                              "message" => "This is a test message.",
 *                              "deviceID" => "1",
 *                              "simSlot" => "0",
 *                              "userID" => "1",
 *                              "status" => "Pending",
 *                              "sentDate" => "2018-10-20T00:00:00+02:00",
 *                              "deliveredDate" => null
 *                              "groupID" => ")V5LxqyBMEbQrl9*J$5bb4c03e8a07b7.62193871"
 *                           ]
 *                   ]
 * @throws Exception If there is an error while sending messages.
 */
function sendMessages($messages, $option = USE_SPECIFIED, $devices = [], $schedule = null, $useRandomDevice = false)
{
    $url = SERVER . "/services/send.php";
    $postData = [
        'messages' => json_encode($messages),
        'schedule' => $schedule,
        'key' => API_KEY,
        'devices' => json_encode($devices),
        'option' => $option,
        'useRandomDevice' => $useRandomDevice
    ];
    return sendRequest($url, $postData)["messages"];
}

/**
 * @param int    $listID   The ID of the contacts list where you want to send this message.
 * @param string $message  The message you want to send.
 * @param int    $option   Set this to USE_SPECIFIED if you want to use devices and SIMs specified in devices argument.
 *                         Set this to USE_ALL_DEVICES if you want to use all available devices and their default SIM to send messages.
 *                         Set this to USE_ALL_SIMS if you want to use all available devices and all their SIMs to send messages.
 * @param array  $devices  The array of ID of devices you want to use to send the message.
 * @param int    $schedule Set it to timestamp when you want to send this message.
 *
 * @return array     Returns The array containing messages.
 * @throws Exception If there is an error while sending messages.
 */
function sendMessageToContactsList($listID, $message, $option = USE_SPECIFIED, $devices = [], $schedule = null)
{
    $url = SERVER . "/services/send.php";
    $postData = [
        'listID' => $listID,
        'message' => $message,
        'schedule' => $schedule,
        'key' => API_KEY,
        'devices' => json_encode($devices),
        'option' => $option
    ];
    return sendRequest($url, $postData)["messages"];
}

/**
 * @param int $id The ID of a message you want to retrieve.
 *
 * @return array     The array containing a message.
 * @throws Exception If there is an error while getting a message.
 */
function getMessageByID($id) {
    $url = SERVER . "/services/read-messages.php";
    $postData = [
        'key' => API_KEY,
        'id' => $id
    ];
    return sendRequest($url, $postData)["messages"][0];
}

/**
 * @param string $groupID The group ID of messages you want to retrieve.
 *
 * @return array     The array containing messages.
 * @throws Exception If there is an error while getting messages.
 */
function getMessagesByGroupID($groupID) {
    $url = SERVER . "/services/read-messages.php";
    $postData = [
        'key' => API_KEY,
        'groupId' => $groupID
    ];
    return sendRequest($url, $postData)["messages"];
}

/**
 * @param string $status The status of messages you want to retrieve.
 * @param int $startTimestamp Search for messages sent or received after this time.
 * @param int $endTimestamp Search for messages sent or received before this time.
 *
 * @return array     The array containing messages.
 * @throws Exception If there is an error while getting messages.
 */
function getMessagesByStatus($status, $startTimestamp, $endTimestamp)
{
    $url = SERVER . "/services/read-messages.php";
    $postData = [
        'key' => API_KEY,
        'status' => $status,
        'startTimestamp' => $startTimestamp,
        'endTimestamp' => $endTimestamp
    ];
    return sendRequest($url, $postData)["messages"];
}

/**
 * @param int $listID       The ID of the contacts list where you want to add this contact.
 * @param string $number    The mobile number of the contact.
 * @param string $name      The name of the contact.
 * @param bool $resubscribe Set it to true if you want to resubscribe this contact if it already exists.
 *
 * @return array     The array containing a newly added contact.
 * @throws Exception If there is an error while adding a new contact.
 */
function addContact($listID, $number, $name = null, $resubscribe = false)
{
    $url = SERVER . "/services/manage-contacts.php";
    $postData = [
        'key' => API_KEY,
        'listID' => $listID,
        'number' => $number,
        'name' => $name,
        'resubscribe' => $resubscribe
    ];
    return sendRequest($url, $postData)["contact"];
}

/**
 * @param int $listID    The ID of the contacts list from which you want to unsubscribe this contact.
 * @param string $number The mobile number of the contact.
 *
 * @return array     The array containing the unsubscribed contact.
 * @throws Exception If there is an error while setting subscription to false.
 */
function unsubscribeContact($listID, $number)
{
    $url = SERVER . "/services/manage-contacts.php";
    $postData = [
        'key' => API_KEY,
        'listID' => $listID,
        'number' => $number,
        'unsubscribe' => true
    ];
    return sendRequest($url, $postData)["contact"];
}

/**
 * @return string    The amount of message credits left.
 * @throws Exception If there is an error while getting message credits.
 */
function getBalance()
{
    $url = SERVER . "/services/send.php";
    $postData = [
        'key' => API_KEY,
    ];
    $credits = sendRequest($url, $postData)["credits"];
    return is_null($credits) ? "Unlimited" : $credits;
}

function sendRequest($url, $postData)
{
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($postData));
    $response = curl_exec($ch);
    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    if (curl_errno($ch)) {
        throw new Exception(curl_error($ch));
    }
    curl_close($ch);
    if ($httpCode == 200) {
        $json = json_decode($response, true);
        if ($json == false) {
            if (empty($response)) {
                throw new Exception("Missing data in request. Please provide all the required information to send messages.");
            } else {
                throw new Exception($response);
            }
        } else {
            if ($json["success"]) {
                return $json["data"];
            } else {
                throw new Exception($json["error"]["message"]);
            }
        }
    } else {
        throw new Exception("HTTP Error Code : {$httpCode}");
    }
}

Send Single Message

try {
    // Send a message using the primary device.
    $msg = sendSingleMessage("+911234567890", "This is a test of single message.");

    // Send a message using the Device ID 1.
    $msg = sendSingleMessage("+911234567890", "This is a test of single message.", 1);
	
    // Send a message using the SIM in slot 1 of Device ID 1 (Represented as "1|0").
    // SIM slot is an index so the index of the first SIM is 0 and the index of the second SIM is 1.
    // In this example, 1 represents Device ID and 0 represents SIM slot index.
    $msg = sendSingleMessage("+911234567890", "This is a test of single message.", "1|0");

    // Send scheduled message using the primary device.
    $msg = sendSingleMessage("+911234567890", "This is a test of schedule feature.", null, strtotime("+2 minutes"));
    print_r($msg);

    echo "Successfully sent a message.";
} catch (Exception $e) {
    echo $e->getMessage();
}

Send Bulk Messages

$messages = array();

for ($i = 1; $i <= 12; $i++) {
    array_push($messages,
        [
            "number" => "+911234567890",
            "message" => "This is a test #{$i} of PHP version. Testing bulk message functionality."
        ]);
}

try {
    // Send messages using the primary device.
    sendMessages($messages);

    // Send messages using default SIM of all available devices. Messages will be split between all devices.
    sendMessages($messages, USE_ALL_DEVICES);
	
    // Send messages using all SIMs of all available devices. Messages will be split between all SIMs.
    sendMessages($messages, USE_ALL_SIMS);

    // Send messages using only specified devices. Messages will be split between devices or SIMs you specified.
    // If you send 12 messages using this code then 4 messages will be sent by Device ID 1, other 4 by SIM in slot 1 of 
    // Device ID 2 (Represendted as "2|0") and remaining 4 by SIM in slot 2 of Device ID 2 (Represendted as "2|1").
    sendMessages($messages, USE_SPECIFIED, [1, "2|0", "2|1"]);
    
    // Send messages on schedule using the primary device.
    sendMessages($messages, null, null, strtotime("+2 minutes"));
    
    // Send a message to contacts in contacts list with ID of 1.
    sendMessageToContactsList(1, "Test", USE_SPECIFIED, 1);
    
    // Send a message on schedule to contacts in contacts list with ID of 1.
    $msgs = sendMessageToContactsList(1, "Test", null, null, strtotime("+2 minutes"));
    
    print_r($msgs);

    echo "Successfully sent bulk messages.";
} catch (Exception $e) {
    echo $e->getMessage();
}

Get remaining message credits

try {
    $credits = getBalance();
    echo "Message Credits Remaining: {$credits}";
} catch (Exception $e) {
    echo $e->getMessage();
}

Get messages and their current status

try {
    // Get a message using the ID.
    $msg = getMessageByID(1);
    print_r($msg);

    // Get messages using the Group ID.
    $msgs = getMessagesByGroupID(')V5LxqyBMEbQrl9*J$5bb4c03e8a07b7.62193871');
    print_r($msgs);
    
    // Get messages received in last 24 hours.
    $msgs = getMessagesByStatus("Received", time() - 86400);
    print_r($msgs);
} catch (Exception $e) {
    echo $e->getMessage();
}

Gestisci contatti

try {
    // Add a new contact to contacts list 1 or resubscribe the contact if it already exists.
    $contact = addContact(1, "+911234567890", "Test", true);
    print_r($contact);
    
    // Unsubscribe a contact using the mobile number.
    $contact = unsubscribeContact(1, "+911234567890");
    print_r($contact);
} catch (Exception $e) {
    echo $e->getMessage();
}



C# Integration

using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Text;
using System.Web;
using Gateway_Sample_Application.Properties;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

namespace SMS
{
    static class API
    {
        private static readonly string Server = "https://sms.sendapp.live"
        private static readonly string Key = "6e1bdb4ed91f3b83071dd5a520c9d226ea19245e";

        public enum Option
        {
            USE_SPECIFIED = 0,
            USE_ALL_DEVICES = 1,
            USE_ALL_SIMS = 2
        }

        /// <summary>
        /// Send single message to specific mobile number.
        /// </summary>
        /// <param name="number">The mobile number where you want to send message.</param>
        /// <param name="message">The message you want to send.</param>
        /// <param name="device">The ID of a device you want to use to send this message.</param>
        /// <param name="schedule">Set it to timestamp when you want to send this message.</param>
        /// <exception>If there is an error while sending a message.</exception>
        /// <returns>The dictionary containing information about the message.</returns>
        public static Dictionary<string, object> SendSingleMessage(string number, string message, string device = "0", long? schedule = null)
        {
            var values = new Dictionary<string, object>
            {
                { "number", number},
                { "message", message},
                { "schedule", schedule },
                { "key", Key },
                { "devices", device }
            };

            return GetMessages(GetResponse($"{Server}/services/send.php", values)["messages"])[0];
        }

        /// <summary>
        /// Send multiple messages to different mobile numbers.
        /// </summary>
        /// <param name="messages">The array containing numbers and messages.</param>
        /// <param name="option">Set this to USE_SPECIFIED if you want to use devices and SIMs specified in devices argument.
        /// Set this to USE_ALL_DEVICES if you want to use all available devices and their default SIM to send messages.
        /// Set this to USE_ALL_SIMS if you want to use all available devices and all their SIMs to send messages.</param>
        /// <param name="devices">The array of ID of devices you want to use to send these messages.</param>
        /// <param name="schedule">Set it to timestamp when you want to send this message.</param>
        /// <param name="useRandomDevice">Set it to true if you want to send messages using only one random device from selected devices.</param>
        /// <exception>If there is an error while sending messages.</exception>
        /// <returns>The array containing messages.</returns>
        public static Dictionary<string, object>[] SendMessages(List<Dictionary<string, string>> messages, Option option = Option.USE_SPECIFIED, string[] devices = null, long? schedule = null, bool useRandomDevice = false)
        {
            var values = new Dictionary<string, object>
            {
                { "messages", JsonConvert.SerializeObject(messages)},
                { "schedule", schedule },
                { "key", Key },
                { "devices", devices },
                { "option", (int) option },
                { "useRandomDevice", useRandomDevice }
            };

            return GetMessages(GetResponse($"{Server}/services/send.php", values)["messages"]);
        }

        /// <summary>
        /// Send a message to contacts in specified contacts list.
        /// </summary>
        /// <param name="listID">The ID of the contacts list where you want to send this message.</param>
        /// <param name="message">The message you want to send.</param>
        /// <param name="option">Set this to USE_SPECIFIED if you want to use devices and SIMs specified in devices argument.
        /// Set this to USE_ALL_DEVICES if you want to use all available devices and their default SIM to send messages.
        /// Set this to USE_ALL_SIMS if you want to use all available devices and all their SIMs to send messages.</param>
        /// <param name="devices">The array of ID of devices you want to use to send these messages.</param>
        /// <param name="schedule">Set it to timestamp when you want to send this message.</param>
        /// <exception>If there is an error while sending messages.</exception>
        /// <returns>The array containing messages.</returns>
        public static Dictionary<string, object>[] SendMessageToContactsList(int listID, string message, Option option = Option.USE_SPECIFIED, string[] devices = null, long? schedule = null)
        {
            var values = new Dictionary<string, object>
            {
                { "listID", listID},
                { "message", message},
                { "schedule", schedule },
                { "key", Key },
                { "devices", devices },
                { "option", (int) option }
            };

            return GetMessages(GetResponse($"{Server}/services/send.php", values)["messages"]);
        }

        /// <summary>
        /// Get a message using the ID.
        /// </summary>
        /// <param name="id">The ID of a message you want to retrieve.</param>
        /// <exception>If there is an error while getting a message.</exception>
        /// <returns>The dictionary containing information about the message.</returns>
        public static Dictionary<string, object> GetMessageByID(int id)
        {
            var values = new Dictionary<string, object>
            {
                { "key", Key },
                { "id", id }
            };

            return GetMessages(GetResponse($"{Server}/services/read-messages.php", values)["messages"])[0];
        }

        /// <summary>
        /// Get messages using the Group ID.
        /// </summary>
        /// <param name="groupID">The group ID of messages you want to retrieve.</param>
        /// <exception>If there is an error while getting messages.</exception>
        /// <returns>The array containing messages.</returns>
        public static Dictionary<string, object>[] GetMessagesByGroupID(string groupID)
        {
            var values = new Dictionary<string, object>
            {
                { "key", Key },
                { "groupId", groupID }
            };

            return GetMessages(GetResponse($"{Server}/services/read-messages.php", values)["messages"]);
        }

        /// <summary>
        /// Get messages using the status.
        /// </summary>
        /// <param name="status">The status of messages you want to retrieve.</param>
        /// <param name="startTimestamp">Search for messages sent or received after this time.</param>
        /// <param name="endTimestamp">Search for messages sent or received before this time.</param>
        /// <exception>If there is an error while getting messages.</exception>
        /// <returns>The array containing messages.</returns>
        public static Dictionary<string, object>[] GetMessagesByStatus(string status, long? startTimestamp = null, long? endTimestamp = null)
        {
            var values = new Dictionary<string, object>
            {
                { "key", Key },
                { "status", status },
                { "startTimestamp", startTimestamp },
                { "endTimestamp", endTimestamp }
            };

            return GetMessages(GetResponse($"{Server}/services/read-messages.php", values)["messages"]);
        }
        
        /// <summary>
        /// Add a new contact to contacts list.
        /// </summary>
        /// <param name="listID">The ID of the contacts list where you want to add this contact.</param>
        /// <param name="number">The mobile number of the contact.</param>
        /// <param name="name">The name of the contact.</param>
        /// <param name="resubscribe">Set it to true if you want to resubscribe this contact if it already exists.</param>
        /// <returns>A dictionary containing details about a newly added contact.</returns>
        public static Dictionary<string, object> AddContact(int listID, string number, string name = null, bool resubscribe = false)
        {
            var values = new Dictionary<string, object>
            {
                {"key", Key},
                {"listID", listID},
                {"number", number},
                {"name", name},
                {"resubscribe", resubscribe ? '1' : '0'},
            };
            JObject jObject = (JObject) GetResponse($"{Server}/services/manage-contacts.php", values)["contact"];
            return jObject.ToObject<Dictionary<string, object>>();
        }
        
        /// <summary>
        /// Unsubscribe a contact from the contacts list.
        /// </summary>
        /// <param name="listID">The ID of the contacts list from which you want to unsubscribe this contact.</param>
        /// <param name="number">The mobile number of the contact.</param>
        /// <returns>A dictionary containing details about the unsubscribed contact.</returns>
        public static Dictionary<string, object> UnsubscribeContact(int listID, string number)
        {
            var values = new Dictionary<string, object>
            {
                {"key", Key},
                {"listID", listID},
                {"number", number},
                {"unsubscribe", '1'}
            };
            JObject jObject = (JObject)GetResponse($"{Server}/services/manage-contacts.php", values)["contact"];
            return jObject.ToObject<Dictionary<string, object>>();
        }
        
        /// <summary>
        /// Get remaining message credits.
        /// </summary>
        /// <exception>If there is an error while getting message credits.</exception>
        /// <returns>The amount of message credits left.</returns>
        public static string GetBalance()
        {
            var values = new Dictionary<string, object>
            {
                {"key", Key}
            };
            JToken credits = GetResponse($"{Server}/services/send.php", values)["credits"];
            if (credits.Type != JTokenType.Null)
            {
                return credits.ToString();
            }
            return "Unlimited";
        }

        private static Dictionary<string, object>[] GetMessages(JToken messagesJToken)
        {
            JArray jArray = (JArray)messagesJToken;
            var messages = new Dictionary<string, object>[jArray.Count];
            for (var index = 0; index < jArray.Count; index++)
            {
                messages[index] = jArray[index].ToObject<Dictionary<string, object>>();
            }
            return messages;
        }

        private static JToken GetResponse(string url, Dictionary<string, object> postData)
        {
            var request = (HttpWebRequest)WebRequest.Create(url);
            var dataString = CreateDataString(postData);
            var data = Encoding.UTF8.GetBytes(dataString);

            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
            request.ContentLength = data.Length;
            ServicePointManager.Expect100Continue = true;
            ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
            using (var stream = request.GetRequestStream())
            {
                stream.Write(data, 0, data.Length);
            }

            var response = (HttpWebResponse)request.GetResponse();

            if (response.StatusCode == HttpStatusCode.OK)
            {
                using (StreamReader streamReader = new StreamReader(response.GetResponseStream()))
                {
                    var jsonResponse = streamReader.ReadToEnd();
                    try
                    {
                        JObject jObject = JObject.Parse(jsonResponse);
                        if ((bool)jObject["success"])
                        {
                            return jObject["data"];
                        }
                        throw new Exception(jObject["error"]["message"].ToString());
                    }
                    catch (JsonReaderException)
                    {
                        if (string.IsNullOrEmpty(jsonResponse))
                        {
                            throw new InvalidDataException("Missing data in request. Please provide all the required information to send messages.");
                        }
                        throw new Exception(jsonResponse);
                    }
                }
            }

            throw new WebException($"HTTP Error : {(int)response.StatusCode} {response.StatusCode}");
        }

        private static string CreateDataString(Dictionary<string, object> data)
        {
            StringBuilder dataString = new StringBuilder();
            bool first = true;
            foreach (var obj in data)
            {
                if (obj.Value != null)
                {
                    if (first)
                    {
                        first = false;
                    }
                    else
                    {
                        dataString.Append("&");
                    }
                    dataString.Append(HttpUtility.UrlEncode(obj.Key));
                    dataString.Append("=");
                    dataString.Append(obj.Value is string[]
                        ? HttpUtility.UrlEncode(JsonConvert.SerializeObject(obj.Value))
                        : HttpUtility.UrlEncode(obj.Value.ToString()));
                }
            }
            return dataString.ToString();
        }
    }
}

Send Single Message

try
{
    // Send a message using the primary device.
    SMS.API.SendSingleMessage("+911234567890", "This is a test of single message.");

    // Send a message using the Device ID 1.
    Dictionary<string, object> message = SMS.API.SendSingleMessage("+911234567890", "This is a test of single message.", "1");
	
    // Send a message using the SIM in slot 1 of Device ID 1 (Represented as "1|0").
    // SIM slot is an index so the index of the first SIM is 0 and the index of the second SIM is 1.
    // In this example, 1 represents Device ID and 0 represents SIM slot index.
    Dictionary<string, object> message = SMS.API.SendSingleMessage("+911234567890", "This is a test of single message.", "1|0");

    // Send scheduled message using the primary device.
    long timestamp = (long) DateTime.UtcNow.AddMinutes(2).Subtract(new DateTime(1970, 1, 1)).TotalSeconds;
    Dictionary<string, object> message = SendSingleMessage(textBoxNumber.Text, textBoxMessage.Text, null, timestamp);
    
    MessageBox.Show("Successfully sent a message.");
}
catch (Exception exception)
{
    MessageBox.Show(exception.Message, "!Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}

Send Bulk Messages

List<Dictionary<string, string>> messages = new List<Dictionary<string, string>>();
for (int i = 1; i <= 12; i++)
{
    var message = new Dictionary<string, string>
    {
        { "number", "+911234567890" },
        { "message", "This is a test #{$i} of C# version. Testing bulk message functionality." }
    };
    messages.Add(message);
}

try
{
    // Send messages using the primary device.
    SMS.API.SendMessages(messages);

    // Send messages using default SIM of all available devices. Messages will be split between all devices.
    SMS.API.SendMessages(messages, SMS.API.Option.USE_ALL_DEVICES);
	
    // Send messages using all SIMs of all available devices. Messages will be split between all SIMs.
    SMS.API.SendMessages(messages, SMS.API.Option.USE_ALL_SIMS);

    // Send messages using only specified devices. Messages will be split between devices or SIMs you specified.
    // If you send 12 messages using this code then 4 messages will be sent by Device ID 1, other 4 by SIM in slot 1 of 
    // Device ID 2 (Represendted as "2|0") and remaining 4 by SIM in slot 2 of Device ID 2 (Represendted as "2|1").
    SMS.API.SendMessages(messages, SMS.API.Option.USE_SPECIFIED, new [] {"1", "2|0", "2|1"});
    
    // Send messages on schedule using the primary device.
    long timestamp = (long) DateTime.UtcNow.AddMinutes(2).Subtract(new DateTime(1970, 1, 1)).TotalSeconds;
    Dictionary<string, object>[] messages = SMS.API.SendMessages(messages, Option.USE_SPECIFIED, null, timestamp);
    
    // Send a message to contacts in contacts list with ID of 1.
    Dictionary<string, object>[] messages = SMS.API.SendMessageToContactsList(1, "Test", SMS.API.Option.USE_SPECIFIED, new [] {"1"});

    // Send a message on schedule to contacts in contacts list with ID of 1.
    Dictionary<string, object>[] messages = SMS.API.SendMessageToContactsList(1, "Test #1", Option.USE_SPECIFIED, null, timestamp);
    
    MessageBox.Show("Success");
}
catch (Exception exception)
{
    MessageBox.Show(exception.Message, "!Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}

Get remaining message credits

try
{
    string credits = SMS.API.GetBalance();
    MessageBox.Show($"Message Credits Remaining: {credits}");
}
catch (Exception exception)
{
    MessageBox.Show(exception.Message, "!Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}

Get messages and their current status

try 
{
    // Get a message using the ID.
    Dictionary<string, object> message = SMS.API.GetMessageByID(1);

    // Get messages using the Group ID.
    Dictionary<string, object>[] messages = SMS.API.GetMessagesByGroupID(")V5LxqyBMEbQrl9*J$5bb4c03e8a07b7.62193871");
    
    // Get messages received in last 24 hours.
    long timestamp = (long) DateTime.UtcNow.AddHours(-24).Subtract(new DateTime(1970, 1, 1)).TotalSeconds;
    GetMessagesByStatus("Received", timestamp);
}
catch (Exception exception)
{
    MessageBox.Show(exception.Message, "!Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}

Gestisci contatti

try {
    // Add a new contact to contacts list 1 or resubscribe the contact if it already exists.
    Dictionary<string, object> contact = SMS.API.AddContact(1, "+911234567890", "Test C#", true);
    
    // Unsubscribe a contact using the mobile number.
    Dictionary<string, object> contact = UnsubscribeContact(1, "+911234567890");
}
catch (Exception exception)
{
    MessageBox.Show(exception.Message, "!Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}