src/Amadeus/Client/Session/Handler/Base.php
protected function getWsdlIdFor($messageName)
    {
        $msgAndVer = $this->getMessagesAndVersions();

        if (isset($msgAndVer[$messageName]) && isset($msgAndVer[$messageName]['wsdl'])) {
            return $msgAndVer[$messageName]['wsdl'];
        }

        return null;
    }
protected function getWsdlIdFor($messageName)
    {
        $msgAndVer = $this->getMessagesAndVersions();

        if (isset($msgAndVer[$messageName]) && isset($msgAndVer[$messageName]['wsdl'])) {
            return $msgAndVer[$messageName]['wsdl'];
        }

        return null;
    }
Get the WSDL ID for the given message

@param $messageName
@return string|null