Prices a basket and returns exactly what POST /orders would charge — without creating anything.Same body, same validation, same error codes as POST /orders. Nothing is written and nothing is reserved, so a product can still sell out between the quote and the order.Use it to render the basket and the total in your own checkout. The response has no uid, internal_id, number, status, payment_status or created_at — only totals, applied, items and warnings.Required ability:orders:write.