plugins/payment/classes/yf_payment_api__provider_zefy.class.php
<?php
//_class('payment_api__provider_remote');
_class('payment_api__provider_remote');
//class yf_payment_api__provider_zephyr extends yf_payment_api__provider_remote
class yf_payment_api__provider_zefy extends yf_payment_api__provider_remote
{
public $ENABLE = true;
}