Application.ini: booking.username = "username" booking.password = "password" booking.server = "http://distribution-xml.booking.com/xml-rpc" booking.language = "en" Controller.php: public function init() { $this->_options = Zend_Registry::get('config')->booking->toArray(); $this->_booking = new Booking_Service_Booking($this->_options); } Usage: var_dump($this->_booking->getCountries());