Defining operations in REST API

I am working on a message request which will have complete request details used to create a record in destination.

This integration create 3 different type of records (Order, shipment, invoice) at different times i.e. it will not always possible to create all at once, so I need to let the system know to create only certain requests.

My questions, what would be the best to way to add this information in request ?

• Does it need to be in body of the request ?

   {
   "OrderNumber": "1234", 
   "operation": [
       "orderentry",
       "shipment",
       "invoice"
   ]
  

  }

• Does it need to be in path ?

/Order/create?operation=orderentry

• Does it need to be in seperate object ? say

   {
   "operation": [
       "orderentry",
       "shipment",
       "invoice"
   ],
   "request": {
       "OrderNumber": "1234", 
  
   }
  

  }