api-endpoint.java

 @PostMapping("/process-items")
public InvokeResponse processItems(@RequestBody InvokeRequest req) {

  System.out.println("JAVA: Received items and sending... elsewhere...");

  // we get a list of items, and do *something*
  // ... then push them somewhere else...

  InvokeResponse resp = new InvokeResponse();
  resp.Outputs.put("output1", req.Data);
  resp.Outputs.put("output2", req.Data);
  return resp;
}