/**
* Validate State Code for US only
* Validate State Code for other country not US
*
* @param string $value
*
* @return boolean
*/
public function validUsa($value)
{
if ($this->_country == 'US')
{
return SagepayValid::notEmpty($value);
}
else
{
return SagepayValid::equals($value, "");
}
}
