Issue with REST API

Hello, with the RESTful API I've successfully used the GET method to query an existing RQ... record; now I'm trying to add (Create) a new record with all the required fields.  The orig.operator="external"  is the condition to execute some processes in Service Manager (  / rmq.update) and I don't know how to obtain the new RQ number created.  ¿any suggestions?

Thanks in advance