Secure & Scalable
SMS Gateway API

// 1. API Configuration
$api_url = "https://sms.sksoftdev.com/api/send_sms.php";
$api_key = "sk_live_1234567890abcdef";

// 2. Generate Security Signature
$timestamp = time();
$nonce = bin2hex(random_bytes(16));
$signature = hash_hmac('sha256', $data_string, $secret);

// 3. Send Request
$payload = [
    "mobile_number" => "88017XXXXXXXX",
    "message" => "Your OTP is 123456",
    "signature" => $signature
];
curl_post($api_url, $payload);