paypal pro recurring payment method implement in php

1 step-> create a paypalconfig.php
----------------------------------------------------------------------------
<?php
class paypal_pro
{
    public $API_USERNAME;
    public $API_PASSWORD;
    public $API_SIGNATURE;
    public $API_ENDPOINT;
    public $USE_PROXY;
    public $PROXY_HOST;
    public $PROXY_PORT;
    public $PAYPAL_URL;
    public $VERSION;
    public $NVP_HEADER;
    public $CURLEMPTYCHECK=FALSE;
   
    function __construct($API_USERNAME, $API_PASSWORD, $API_SIGNATURE, $PROXY_HOST, $PROXY_PORT, $IS_ONLINE = FALSE, $USE_PROXY = FALSE, $VERSION = '57.0')
    {
   
        $this->API_USERNAME = $API_USERNAME;
        $this->API_PASSWORD = $API_PASSWORD;
        $this->API_SIGNATURE = $API_SIGNATURE;
        $this->API_ENDPOINT = 'https://api-3t.paypal.com/nvp';
        $this->USE_PROXY = $USE_PROXY;
        if($this->USE_PROXY == true)
        {
            $this->PROXY_HOST = $PROXY_HOST;
            $this->PROXY_PORT = $PROXY_PORT;
        }
        else
        {
            $this->PROXY_HOST = '127.0.0.1';
            $this->PROXY_PORT = '808';
        }
        if($IS_ONLINE == FALSE)
        {
            $this->PAYPAL_URL = 'https://www.sandbox.paypal.com/webscr&cmd=_express-checkout&token=';
        }
        else
        {
            $this->PAYPAL_URL = 'https://www.paypal.com/webscr&cmd=_express-checkout&token=';
        }
        $this->VERSION = $VERSION;
    }

    function hash_call($methodName,$nvpStr)
    {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL,$this->API_ENDPOINT);
        curl_setopt($ch, CURLOPT_VERBOSE, 1);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
        curl_setopt($ch, CURLOPT_POST, 1);
        if($this->USE_PROXY)
        {
            curl_setopt ($ch, CURLOPT_PROXY, $this->PROXY_HOST.":".$this->PROXY_PORT);
        }
        $nvpreq="METHOD=".urlencode($methodName)."&VERSION=".urlencode($this->VERSION)."&PWD=".urlencode($this->API_PASSWORD)."&USER=".urlencode($this->API_USERNAME)."&SIGNATURE=".urlencode($this->API_SIGNATURE).$nvpStr;
        curl_setopt($ch,CURLOPT_POSTFIELDS,$nvpreq);
        $response = curl_exec($ch);
        $nvpResArray=$this->deformatNVP($response);
        $nvpReqArray=$this->deformatNVP($nvpreq);
        $_SESSION['nvpReqArray']=$nvpReqArray;
        if (curl_errno($ch))
        {
            $this->CURLEMPTYCHECK=TRUE;
   
        }
        else
        {
            curl_close($ch);
        }

    return $nvpResArray;
    }

    function deformatNVP($nvpstr)
    {

        $intial=0;
        $nvpArray = array();
        while(strlen($nvpstr))
        {
            $keypos= strpos($nvpstr,'=');
            $valuepos = strpos($nvpstr,'&') ? strpos($nvpstr,'&'): strlen($nvpstr);
            $keyval=substr($nvpstr,$intial,$keypos);
            $valval=substr($nvpstr,$keypos+1,$valuepos-$keypos-1);
            $nvpArray[urldecode($keyval)] =urldecode( $valval);
            $nvpstr=substr($nvpstr,$valuepos+1,strlen($nvpstr));
         }
        return $nvpArray;
    }

    function __destruct()
    {

    }
}
?>
----------------------end cofig class--------------------------------------

2 step-> indclude paypalconfig.php where you input user information.
if(isset($_REQUEST['paynow'])){
require_once("paypal_pro.inc.php");
$firstName =urlencode( $_POST['firstName']);
$lastName =urlencode( $_POST['lastName']);
$creditCardType =urlencode( $_POST['creditCardType']);
$creditCardNumber = urlencode($_POST['creditCardNumber']);
$expDateMonth =urlencode( $_POST['expDateMonth']);
$padDateMonth = str_pad($expDateMonth, 2, '0', STR_PAD_LEFT);
$expDateYear =urlencode( $_POST['expDateYear']);
$cvv2Number = urlencode($_POST['cvv2Number']);
$address1 = urlencode($_POST['address1']);
$address2 = urlencode($_POST['address2']);
$city = urlencode($_POST['city']);
$state =urlencode( $_POST['state']);
$zip = urlencode($_POST['zip']);
$amount = urlencode($_POST['amount']);
$currencyCode="USD";
$paymentAction = urlencode("Sale");
 $carderrormsg="";


    $profileStartDate = urlencode(date('Y-m-d h:i:s'));
    $billingPeriod = urlencode($_POST['billingPeriod']);// or "Day", "Week", "SemiMonth", "Year"
    $billingFreq = urlencode($_POST['billingFreq']);// combination of this and billingPeriod must be at most a year
    $initAmt = $amount;
    $failedInitAmtAction = urlencode("ContinueOnFailure");
    $desc = urlencode("Recurring $".$amount);
    $autoBillAmt = urlencode("AddToNextBilling");
    $profileReference = urlencode("Anonymous");
    $methodToCall = 'CreateRecurringPaymentsProfile';
    $nvpRecurring ='&BILLINGPERIOD='.$billingPeriod.'&BILLINGFREQUENCY='.$billingFreq.'&PROFILESTARTDATE='.$profileStartDate.'&INITAMT='.$initAmt.'&FAILEDINITAMTACTION='.$failedInitAmtAction.'&DESC='.$desc.'&AUTOBILLAMT='.$autoBillAmt.'&PROFILEREFERENCE='.$profileReference;


$nvpstr='&PAYMENTACTION='.$paymentAction.'&AMT='.$amount.'&CREDITCARDTYPE='.$creditCardType.'&ACCT='.$creditCardNumber.'&EXPDATE='.         $padDateMonth.$expDateYear.'&CVV2='.$cvv2Number.'&FIRSTNAME='.$firstName.'&LASTNAME='.$lastName.'&STREET='.$address1.'&CITY='.$city.'&STATE='.$state.'&ZIP='.$zip.'&COUNTRYCODE=US&CURRENCYCODE='.$currencyCode.$nvpRecurring;


//$paypalPro = new paypal_pro('nayakr.bikash@gmail.com', 'QFZCW5555N5HZM8VBG7Q', 'A.d9eRKfd1yVkRrtmMfCFLTqa655555M9AyodL0SJkh55555YztxUi8W9pCXF6.4NI', '', '', FALSE, FALSE );

$resArray = $paypalPro->hash_call($methodToCall,$nvpstr);
echo "<pre>";print_r($resArray ) ;