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

        $found = null;

        if (isset($msgAndVer[$messageName]) && isset($msgAndVer[$messageName]['version'])) {
            $found = $msgAndVer[$messageName]['version'];
        }

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

        $found = null;

        if (isset($msgAndVer[$messageName]) && isset($msgAndVer[$messageName]['version'])) {
            $found = $msgAndVer[$messageName]['version'];
        }

        return $found;
    }
Get the version number active in the WSDL for the given message

@param $messageName
@return float|string|null