I am attempting to develop a Requisition application in Oracle APEX using the cXML Request/Response standard with an external supplier partner. The process starts in APEX by building a cXML request to our supplier partners endpoint. Via an APEX Processing processes (button click fires process), I build a cXML payload with credentials and a return URL to the APEX application. The external partner validates by request and sends a response with their external URL. I then can navigate to the external punchout site from my APEX application using a branch. This is all working fine.