Как передать URL страницы с параметрами action=?

<?php
/**
 * [PHPFOX_HEADER]
 */
defined('PHPFOX') or exit('NO DICE!');
class Phpfox_Gateway_Api_belentlik implements Phpfox_Gateway_Interface
{
    /**
     * Holds an ARRAY of settings to pass to the form
     *
     * @var array
     */
    private $_aParam = array();
    /**
     * Holds an ARRAY of supported currencies for this payment gateway
     *
     * @var array
     */
    private $_aCurrency = array('USD');
    /**
     * Class constructor
     *
     */
    public function __construct()
    {
    }   
    /**
     * Set the settings to be used with this class and prepare them so they are in an array
     *
     * @param array $aSetting ARRAY of settings to prepare
     */
    public function set($aSetting)
    {
        $this->_aParam = $aSetting;
        if (Phpfox::getLib('parse.format')->isSerialized($aSetting['setting']))
        {
            $this->_aParam['setting'] = unserialize($aSetting['setting']);
        }
    }
    /**
     * Each gateway has a unique list of params that must be passed with the HTML form when posting it
     * to their site. This method creates that set of custom fields.
     *
     * @return array ARRAY of all the custom params
     */
    public function getEditForm()
    {       
        return array(
            'apiKey' => array(
                'phrase' => Phpfox::getPhrase('apiKey'),
                'phrase_info' => Phpfox::getPhrase('apiKey_info'),
                'value' => (isset($this->_aParam['setting']['apiKey']) ? $this->_aParam['setting']['apiKey'] : '')
            ),
            'merchantAccountCode' => array(
                'phrase' => Phpfox::getPhrase('merchantAccountCode'),
                'phrase_info' => Phpfox::getPhrase('merchantAccountCode_info'),
                'value' => (isset($this->_aParam['setting']['merchantAccountCode']) ? $this->_aParam['setting']['merchantAccountCode'] : '')
            )
        );
    }
    /**
     * Returns the actual HTML <form> used to post information to the 3rd party gateway when purchasing
     * an item using this specific payment gateway
     *
     * @return bool FALSE if we can't use this payment gateway to purchase this item or ARRAY if we have successfully created a form
     */
    public function getForm()
    {       
        $bCurrencySupported = true;
        if (!in_array($this->_aParam['currency_code'], $this->_aCurrency))
        {
            if (!empty($this->_aParam['alternative_cost']))
            {
                $aCosts = unserialize($this->_aParam['alternative_cost']);
                foreach ($aCosts as $aCost)
                {
                    $sCode = key($aCost);
                    $iPrice = $aCost[key($aCost)];
                    if (in_array($sCode, $this->_aCurrency))
                    {
                        $this->_aParam['amount'] = $iPrice;
                        $this->_aParam['currency_code'] = $sCode;
                        $bCurrencySupported = false;
                        break;
                    }
                }
                if ($bCurrencySupported === true)
                {
                    return false;
                }
            }
            else
            {
                return false;
            }
        }   
        if( isset ($_GET['action'])) { 

header( "Location: ". $url ); $url = 'https://lk.belentlik.tm/gates/paypage?action='.$arr['action‌​']; }

    $aParts = explode('|', $this->_aParam['item_number']);
    $aForm = array(
        'url' => 'https://lk.belentlik.tm/gates/signature?', 
        'param' => array(
            'requestType' => 'Sale',
            'merchantAccountCode' => $this->_aParam['setting']['merchantAccountCode'],
            'transactionIndustryType' => 'EC',
            'accountType' => 'R',
            'accountNumber' => '4111111111111111',
            'accountAccessory' => '0422',
            'CVV2' => '123',
            'amount' => '10',
                            'currency' => $this->_aParam['currency_code'],
            'lang' => 'RU',
            'item Code' => '999999',
            'transactionCode' => '0000000001',
            'customerAccountCode' => '1818',
            'ticketNumber' => $this->_aParam['item_number'],
            'memo' => 'xyz',
            'itemCount' => '2',
            'items' => '',
            'holderType' => 'P',
            'holderName' => 'MARS+SNIKERS',
            'holderBirthdate' => '',
            'countryCode' => 'US',  
                            'state'=>'',
                            'street'=>'',
                        'city'=>'',
                        'zipCode'=>'',
                        'phone'=>'',
                        'email'=>'',
                        'apiKey' => $this->_aParam['setting']['apiKey'],
    ),

    );  

$response = file_get_contents('https://lk.belentlik.tm/gates/signature'); parse_str($response, $arr);

    if ($this->_aParam['is_test'])
    {
        $aForm['param']['demo'] = 'Y';
    }
    return $aForm;
}
/**
 * Performs the callback routine when the 3rd party payment gateway sends back a request to the server,
 * which we must then back and verify that it is a valid request. This then connects to a specific module
 * based on the information passed when posting the form to the server.
 *
 */
public function callback()