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            $apiKey = "ringq_live_127f4c25daeb";
            $secret = "703311cbeba8a98ed6f08713ceccf62a73fd16a37d3d578e3ce25e2ee0a25ae3";
            $url    = "https://station.ind1.ringq.ai:8443/index/makeCall";

            $body = '{"from":"1013","to":"1016","domain":"station.ind1.ringq.ai"}';


            // =====================================================
            // STEP 1: GET API SERVER TIME FROM DATE HEADER
            // =====================================================
            $ch = curl_init($url);

            curl_setopt_array($ch, [
            CURLOPT_NOBODY => true,
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_HEADER => true,
            CURLOPT_SSL_VERIFYPEER => false,
            CURLOPT_SSL_VERIFYHOST => false
            ]);

            $response = curl_exec($ch);
            curl_close($ch);

            // Extract Date header
            preg_match('/^Date:\s*(.+)$/mi', $response, $matches);

            if (!empty($matches[1])) {
                $serverTimestamp = strtotime(trim($matches[1]));
            } else {
                // fallback (should not happen)
                $serverTimestamp = time();
            }

            // Convert to string
            $timestamp = (string)$serverTimestamp;

            // Generate nonce
            $nonce = bin2hex(random_bytes(5)); // 10 char

            // =====================================================
            // STEP 2: CREATE SIGNATURE
            // =====================================================
            $payload   = $apiKey . $timestamp . $nonce . $body;
            $signature = hash_hmac("sha256", $payload, $secret);


            // =====================================================
            // STEP 3: SEND ACTUAL REQUEST
            // =====================================================
            $ch = curl_init();

            curl_setopt_array($ch, [
                CURLOPT_URL => $url,
                CURLOPT_CUSTOMREQUEST => "POST",
                CURLOPT_RETURNTRANSFER => true,
                CURLOPT_POSTFIELDS => $body,
                CURLOPT_HTTPHEADER => [
                    "Content-Type: application/json",
                    "Accept: application/json",
                    "User-Agent: PostmanRuntime/7.32.3",
                    "Connection: close",
                    "Content-Length: " . strlen($body),
                    "X-API-KEY: $apiKey",
                    "X-TIMESTAMP: $timestamp",
                    "X-NONCE: $nonce",
                    "X-SIGNATURE: $signature"
                ],
                CURLOPT_SSL_VERIFYPEER => false,
                CURLOPT_SSL_VERIFYHOST => false,
                CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
                CURLOPT_ENCODING => ""
            ]);

            $response = curl_exec($ch);
            $info     = curl_getinfo($ch);
            $error    = curl_error($ch);

            curl_close($ch);


            // =====================================================
            // DEBUG OUTPUT
            // =====================================================
            echo "Response:$response";