Process Designer - ObjectEvent Handlers

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I am writing code in Object event handlers and want to get the Inicident fields like Queue, Category Id, Primary Contact from Incident That I create from agent desktop

As Queue is NamedID field and Category is a NamedIDHierarchy Field, I don't know how to write coe to get these fields based on the Ref number of the Inicident that I create

I need to use there fields to pass in to CURL PHP.

I am using below code to get ReF number of the Inicident and using in an ROQL query

$CaptureRefId  is getting the Ref number

$CaptureRefId = $object->LookupName;