code: public JSONObject assignToEngagement(String engagement_ref, HashMap<String, String> params) throws JSONException {
          return oClient.put("/tasks/v2/tasks/contracts/" + engagement_ref, params);
      }
docs: Assign engagements to the list of activities
  
  @param   engagement_ref Engagement reference
  @param   params Parameters
  @throws	JSONException If error occurred
  @return	{@link JSONObject}