Help creating API to get GradeID in Application Composer HRHD object

Summary:

I'm trying to get the GradeID using Web Services in application composer. The Web service will be called using a trigger script under the HR Help Desk Request Object.

Content (required):

Currently, I'm using this as the URL

https ://fa-XXXX-test-saasfaprod1.fa.ocs.oraclecloud.com:443/hcmRestApi/resources/11.13.18.05/emps?q=PersonNumber=799265&expand=assignments

I'm then writing a trigger script to call the web service. I'm passing the GUID into the web service.

This is the script i'm using for my trigger script

def GUID = adf.context.getSecurityContext()?.getUserProfile()?.getGUID()

def x = adf.webServices.gradeidtest5.GET(GUID)

def GradeID = x.GradeId

setAttribute('ProblemDescription',GradeID)