PeopleSoft REST Form-Data to Third Party

I am try to connect to a third party REST service that uses form-data.  I am setting the Content-Type to application/x-www-form-urlencoded, but I also need to set another header value that acts as authentication token.  This issue applies to both POST and GET methods.

   &outMSG = CreateMessage(Operation.ABC_NODE_GET, %IntBroker_Request);

   &doc = &outMSG.GetURIDocument();

   &outCom = &doc.DocumentElement;

  

   &outCom.GetPropertyByName("version").value = "v2";

   &outCom.GetPropertyByName("node").value = "7932";

   &outMSG.URIResourceIndex = 1;

   &ret = &outMSG.IBInfo.IBConnectorInfo.AddConnectorProperties("authtoken", "TKQFk8eDUDlIssKLT/2", %Header);

   &outMSG.SegmentContentType = "application/x-www-form-urlencoded";

   &inMSG = %IntBroker.SyncRequest(&outMSG);

When I check the MsgLog.html I can see that the following headers are added by PeopleSoft: