/**
 * Agentic Commerce Protocol (ACP) endpoint — Stripe spec compliant
 * https://docs.stripe.com/agentic-commerce/protocol/specification
 *
 * Routes:
 *   POST   /acp/checkouts           → Create checkout session
 *   GET    /acp/checkouts/:id       → Retrieve checkout state
 *   PUT    /acp/checkouts/:id       → Update checkout (dates, guests)
 *   POST   /acp/checkouts/:id/complete → Complete with SharedPaymentToken
 *   POST   /acp/checkouts/:id/cancel   → Cancel checkout
 *
 * This endpoint implements Stripe's Agentic Commerce Protocol so AI
 * agents can book and pay without a browser redirect.
 */
import type { VercelRequest, VercelResponse } from "./_types.js";
export default function handler(req: VercelRequest, res: VercelResponse): Promise<VercelResponse | undefined>;