Integration broker setup for Retro Pay

Hello,

 We've never used Integration broker, but found that we needed to set it up for Retro Pay in HR 9.1. It appears to be working for the app server that we're testing, but I have a question about the Gateway setup. We have one PIA with 4 websites (4 app. servers therefore 4 JSL ports). Each of these use the same node name, PSFT_HR. So when configuring the Gateway Setup Properties, it asks for a default App. Server URL. Then below you can enter Peoplesoft nodes with app. server URLS. So do I need to have different node names for each app. server? We're