/**
* @desc Openinvoice Optional Fields.
* @desc Notice these are used to prepopulate the fields, but client can edit them at Adyen.
* @return type array
*/
public function getFormFields()
{
$adyFields = parent::getFormFields();
$adyFields = $this->getOptionalFormFields($adyFields, $this->_order);
return $adyFields;
}
