Einstein Bot Invocable method for Returns with Zenkraft

controller.cls

public without sharing class BotReturnOrder {

 @InvocableMethod(label='Bot Return Order')
 public static List<Response> returnOrder(Request[] requests) {
       List<Response> resp = new List<Response>();
   String orderNumber = requests[0].orderNumber;

   Response r = new Response();
   return resp;
 }

   public without sharing class Request {
       @InvocableVariable(label='orderNumber' required=true)
       public String orderNumber;
   }

   public without sharing class Response {
       @InvocableVariable(label='labelUrl' required=true)
       public String labelUrl;
   }
}