public function validate()
{
parent::validate();
$info = $this->getInfoInstance();
$hppType = $info->getCcType();
// validate if the ideal bank is chosen
if ($hppType == "ideal") {
if ($info->getPoNumber() == "") {
// hpp type is empty throw error
Mage::throwException(Mage::helper('adyen')->__('You chose an invalid bank'));
}
}
}
