unable to change payment method end point

-- HikaShop version -- :HikaShop Starter: 2.2.3
-- Joomla version -- : 3.2
-- PHP version -- : 5.4
-- Browser(s) name and version -- : any

Hi,thank you for this extention, im used to virtuemart but since its not yet supported on joomla 3 i decided to test your component.
Im trying to develop need a custom payment method since my gateway is not on the plugin list.(tranzila credit card gateway)
i tried using ogone payment plugin as a base to work on and by changing the POST gateway url located in ogone_end.php.
problem is, no matter what i do it it keeps showing up as the original url " secure.ogone.com/ncol/prod/orderstandard_utf8.asp " when clicking the "finish" button on the checkout page.
i tried clearing the browser cache, clearing joomla cache, using a different browser, but nothing helps....
is there some restriction on editing payment plugins ? if not, what could be the reason ?
thanks

Hi, thank you for answering.
i changed line 82 in administrator/components/com_hikashop/extentions/pluginhikashoppayment_ogone/ogone.php
from:

$this->payment_params->url='https://secure.ogone.com/ncol/prod/orderstandard_utf8.asp';

$this->payment_params->url='https://direct.tranzila.com/myaccount';

<form id="hikashop_ogone_form" name="hikashop_ogone_form" action="<?php echo $this->payment_params->url;?>" method="post">

<form id="hikashop_ogone_form" name="hikashop_ogone_form" action="https://direct.tranzila.com/myaccount" method="post">

Hi, Jerome. yes, i tried both lines.

if($this->payment_params->environnement=='test'){
			$this->payment_params->url='https://direct.tranzila.com/myaccount';
		}else{
			$this->payment_params->url='https://direct.tranzila.com/myaccount';
		}

got it !
hikashop copies the plugin files to
joomla_root/plugins/hikashoppayment/{ogone}/*.*
that's where the change needs to be made.
hope it helps if anyone encounters this problem.