CURL PHP

<?php

 
 $msisdn = substr($_REQUEST['msisdn'], -10);
$msg    = $_REQUEST['msg'];

$userMessage=explode(" ",$msg);
$keyword=$userMessage[0];
$merchantUserName=$userMessage[1];
$password=$userMessage[2];
$couponCode=$userMessage[3];


$arr_fields = array(
    'request_type' => $keyword,
    'mobile_no' => $msisdn,
    'coupon_code' => $couponCode,
    'username' =>  $merchantUserName,
    'password' => $password,
);

$json_encoded_fields = json_encode($arr_fields);

$ch = curl_init();
$curlConfig = array(
    CURLOPT_URL => "http://boupon.com.bd/api/rest/merchantsms",
    CURLOPT_POST => true,
    CURLOPT_RETURNTRANSFER => true,
    curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type:application/json')),
    CURLOPT_POSTFIELDS => $json_encoded_fields
);
curl_setopt_array($ch, $curlConfig);
$result = curl_exec($ch);
/*echo "Result-<br/>";*/
print_r($result);
curl_close($ch);