Use action=complete action along with an XPath to see possible values that are available with the XPath node.
View Configuration Node Values for XPath
View the possible values, such as network interfaces, for multi-vsys firewalls, use the following command: https://firewall/api/?type=config&action=complete&xpath=/api/?type=config&action=get&xpath=/config/devices/entry[@name='localhost.localdomain']/vsys&key=apikey
Confirm that the XML response for the request looks like the following: <response status="success" code="19"> <completions> <completion value="vsys1" vxpath="/config/devices/entry[@name='localhost.localdomain']/vsys/entry[@name='vsys1']" current="yes" help-string="vsys1"/> </completions> </response>

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