$mp = new MP ("XXX", "XXX");

                                        $preference_data = array(
                                            "items" => array(
                                                    array(
                                                    "title" => $producto_nombre,
                                                    "quantity" => intval($producto_cantidad),
                                                    "currency_id" => "ARS", // Available currencies at: https://api.mercadopago.com/currencies
                                                    "unit_price" => intval($precio_unico)
                                                        )
                                                    )

                                        );

                                        $preference = $mp->create_preference($preference_data);

                                        ?>`