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Edit File: Paypalexpress.php

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); 
class Paypalexpress {

/**
* Paypal Express Checkout(NVP) CodeIgniter library
*
* This CodeIgniter library handles payments via paypal.
*
* @package codeigniter-paypal-express-checkout(NVP)
* @author Rakesh Sharma, <sharmarakesh395[at]gmail.com>
* @copyright Copyright (c) 2014, Rakesh Sharma
* @link https://github.com/rakeshksharma/codeigniter-payvector/
*/	
	public $pex_settings;
	
	function __construct($pex_settings){
		$this->pex_settings = $pex_settings;
	}
	
/**
  * hash_call: Function to perform the API call to PayPal using API signature
  * @method_name is name of API  method.
  * @nvpStr is nvp string.
  * returns an associtive array containing the response from the server.
  */

public function hash_call($method_name, $nvpstr)
	{
	    $settings = $this->pex_settings;
	    $nvpheader = "&PWD=".urlencode($settings['api_password'])."&USER=".urlencode($settings['api_username'])."&SIGNATURE=".urlencode($settings['api_signature']);
		//setting the curl parameters.
		$ch = curl_init();
		curl_setopt($ch, CURLOPT_URL,$settings['api_endpoint']);
		curl_setopt($ch, CURLOPT_VERBOSE, 1);
		//turning off the server and peer verification(TrustManager Concept).
		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);
		$nvpstr=$nvpheader.$nvpstr;
		//check if version is included in $nvpstr else include the version.
		if(strlen(str_replace('VERSION=', '', strtoupper($nvpstr))) == strlen($nvpstr)) {
			$nvpstr = "&VERSION=" . urlencode($settings['api_version']) . $nvpstr;	
		}
		$nvpreq="METHOD=".urlencode($method_name).$nvpstr;
		//setting the nvpreq as POST FIELD to curl
		curl_setopt($ch,CURLOPT_POSTFIELDS,$nvpreq);
		//getting response from server
		$response = curl_exec($ch);
		//convrting NVPResponse to an Associative Array
		$nvpresarray = $this->deformat_nvp($response);
		$nvpreqarray = $this->deformat_nvp($nvpreq);
		$_SESSION['nvpreqarray']=$nvpreqarray;
		
		if (curl_errno($ch)) {
			// moving to display page to display curl errors
			$_SESSION['curl_error_no'] = curl_errno($ch) ;
			$_SESSION['curl_error_msg'] = curl_error($ch);
			$location = "APIError.php";
			header("Location: $location");
		} 
		else {
			//closing the curl
			curl_close($ch);
		}
		return $nvpresarray;
	}

/** This function will take nvpstring and convert it to an Associative Array and it will decode the response.
  * It is usefull to search for a particular key and displaying arrays.
  */

function deformat_nvp($nvpstr)
	{
		$intial=0;
		$nvparray = array();
		while(strlen($nvpstr)){
			//postion of Key
			$keypos= strpos($nvpstr,'=');
			//position of value
			$valuepos = strpos($nvpstr,'&') ? strpos($nvpstr,'&'): strlen($nvpstr);
			/*getting the Key and Value values and storing in a Associative Array*/
			$keyval=substr($nvpstr,$intial,$keypos);
			$valval=substr($nvpstr,$keypos+1,$valuepos-$keypos-1);
			//decoding the respose
			$nvparray[urldecode($keyval)] = urldecode($valval);
			$nvpstr=substr($nvpstr,$valuepos+1,strlen($nvpstr));
		}
		return $nvparray;
	}

/** 
  * This function will take token and processing actual payment with token.
  */
	public function make_payment($token) {
	     // Getting settings.
	     $settings = $this->pex_settings;
		 $nvpstr="&TOKEN=".$token;
		 // call api with token and getting result.
		 $resarray = $this->hash_call("GetExpressCheckoutDetails",$nvpstr);
//		mail("anwar.shahid@gmail.com", "IPN Library email (" . $_REQUEST['invId'] . ")", print_r($resarray, true) );
		 $ack = strtoupper($resarray["ACK"]);
		 if($ack == 'SUCCESS' || $ack == 'SUCCESSWITHWARNING'){
			ini_set('session.bug_compat_42',0);
			ini_set('session.bug_compat_warn',0);
			$token = trim($resarray['TOKEN']);
			$payment_amount = trim($resarray['AMT']);
			$payerid = trim($resarray['PAYERID']);
			$server_name = trim($_SERVER['SERVER_NAME']);
			$nvpstr='&TOKEN='.$token.'&PAYERID='.$payerid.'&PAYMENTACTION='.$settings['payment_type'].'&AMT='.$payment_amount.'&CURRENCYCODE='.$settings['currency'].'&IPADDRESS='.$server_name ;
			$oldArray = $resarray;
			$resarray = $this->hash_call("DoExpressCheckoutPayment",$nvpstr);
			 $resarray = array_merge($oldArray, $resarray);

$ack = strtoupper($resarray["ACK"]);
			// checking response for success.
			if($ack != 'SUCCESS' && $ack != 'SUCCESSWITHWARNING'){
				return $resarray;
			}
			else {
			   return $resarray;
			}
		 } 
		 else  
		 {
			return $resarray;
		 }
	}

/** 
  * This function will take NVP string and setting up express checkout call and sending user to paypal url.
  */	
	public function process_payment($nvpstr) {
	    // Getting settings.
	    $settings = $this->pex_settings;
		// call api with nvp string andset checkout request.
	    $resarray = $this->hash_call("SetExpressCheckout",$nvpstr);
		$ack = strtoupper($resarray["ACK"]);
        if($ack=="SUCCESS") {
		  $token = trim($resarray["TOKEN"]);
	      $payurl = $settings['api_url'].$token;
		  // redirect user to paypal url.
		  header("Location: ".$payurl);
		} 
		else {
		  return $resarray;
		}
	}
}