yf_payment_api__provider_system class

Fileplugins/payment/classes/yf_payment_api__provider_system.class.php
Use_class('payment_api__provider_system')
Not loaded by the docs: it runs code outside its class (_class on line 3). Read the source instead.

<?php

_class('payment_api__provider');

class yf_payment_api__provider_system extends yf_payment_api__provider
{
    public $ENABLE = true;
}