Simple example to use paypals express checkout with codeigniter14.06.14

1.
create a paypal php class and save it to application/libraries/Paypal.php

class Paypal {

protected $_errors = array();
   protected $_credentials = array(
      'USER' => 'XXX-facilitator_xxx.com',
      'PWD' => '123456789123',
      'SIGNATURE' => 'Xn5ns1Kso7MWUdW4ErJLIiJ4qi4-BCSXAfge13zgukIbA25t-6-yx2vi',
   );

protected $_endPoint = 'https://api-3t.sandbox.paypal.com/nvp';
   //protected $_endPoint = 'https://api-3t.paypal.com/nvp';
   protected $_version = '74.0';

public function request($method,$params = array()) {
     $this->_errors = array();
     if( empty($method)): 
       $this->_errors = array('API method is missing');
       return false;
     endif;

$requestParams = [
		       'METHOD' => $method,
		       'VERSION' => $this ->_version
		       ] + $this->_credentials;

$request = http_build_query($requestParams + $params);
     $ch = curl_init();
     curl_setopt($ch,CURLOPT_URL, $this->_endPoint);
     curl_setopt($ch,CURLOPT_VERBOSE, 1);
     curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
     curl_setopt($ch,CURLOPT_POST,1);
     curl_setopt($ch,CURLOPT_POSTFIELDS,$request);
     $response = curl_exec($ch);
     if (curl_errno($ch)):
       $this->_errors = curl_error($ch);
       curl_close($ch);
       return false;
     else:
       curl_close($ch);
       $responseArray = array();
       parse_str($response,$responseArray); 
       return $responseArray;
     endif;

}

2.
in your controller call this class like :

$this->load->library('Paypal');

$requestParams = ['RETURNURL' => base_url().'/checkout/success',
                      'CANCELURL' => 'http://www.yourdomain.com/payment/cancelled'];

$orderParams = ['PAYMENTREQUEST_0_AMT' => '666',
		    'PAYMENTREQUEST_0_SHIPPINGAMT' => '4',
		    'PAYMENTREQUEST_0_CURRENCYCODE' => 'USD',
		    'PAYMENTREQUEST_0_ITEMAMT' => '496'
		    ];

$item = ['L_PAYMENTREQUEST_0_NAME0' => 'ItemX',
	     'L_PAYMENTREQUEST_0_DESC0' => 'ItemDesc',
	     'L_PAYMENTREQUEST_0_AMT0' => '496',
	     'L_PAYMENTREQUEST_0_QTY0' => '1'
	     ];

$pp = new Paypal();
    $r = $pp->request('SetExpressCheckout',$requestParams + $orderParams + $item);
    var_dump($r);

http://www.smashingmagazine.com/2011/09/05/getting-started-with-the-paypal-api/

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Simple example to use paypals express checkout with codeigniter14.06.14

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