code: public JSONObject getByBuyersTeam(String buyerTeamReference, HashMap<String, String> params) throws JSONException {
          return oClient.get("/finreports/v2/buyer_teams/" + buyerTeamReference + "/billings", params);
      }
docs: Generate Billing Reports for a Specific Buyer's Team
  
  @param   buyerTeamReference Buyer team reference
  @param   params Parameters
  @throws	JSONException If error occurred
  @return	{@link JSONObject}