def post(resource, params)
      case resource
      when "pedidos", "place_order", "new_order" then url = "/pedidos"
      when "envios", "shipping" then url = "/envios"
      else url = "/#{resource}"
      end

      post_request(url, params)
    end
def post(resource, params)
      case resource
      when "pedidos", "place_order", "new_order" then url = "/pedidos"
      when "envios", "shipping" then url = "/envios"
      else url = "/#{resource}"
      end

      post_request(url, params)
    end
POST resource
 https://www.enviopack.com/documentacion/realiza-un-envio
 req: resource, params
 Client.post("pedidos", params)