fetch running & Startup config files using webservice or rest api call by passing deviceid/hostname

What is the best way to get config files from EMC Voyence, All we have from external system is device name ( host name). We are looking to get config files both running and startup files using a service.

As external application doesnt know the UID , couldn't find a way to get config file without UID?

I am testing using soap ui to get config data , calling "getLatestConfigFile" procedure.  But from a third part system all we get is hostname : CHG_DCNSwitchStack.netact1.xyz.com

http://schemas.xmlsoap.org/soap/encoding/ ">

         http://api.common.configmgr.powerup.com ">

            0a77c03112cc4e93fd0bf289743010000

            OOS

            NETWORK

        

         http://api.common.configmgr.powerup.com ">

            0a77c0319d97d113fc5a5ffef5c010000

            CHG_DCNSwitchStack.netact1.xyz.com

            DEVICE

        

         startup

What is best way to accomplish this requirement?