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Interpreting API input - JSON

I’m looking at pulling from the UPS JSON API for tracking, and struggling a bit. The sample request they provide:

{
   `"UPSSecurity": {
        "UsernameToken": {
        "Username": "Your Username", 
        "Password": "Your Password"
   }, 
   "ServiceAccessToken": {
   "AccessLicenseNumber": "Your Access License Number" 
   }
}, 
"TrackRequest": {
    "Request": {
        "RequestOption": "1", 
        "TransactionReference": {
            "CustomerContext": "Your Test Case Summary Description" }
        },
        "InquiryNumber": "YourTrackingNumber" 
    }
}

Any ideas on how to interpret this into bubble? “YourTrackingNumber” would of course be the input tracking number from the user

Thank you
-John