Problem
Hotels and hotel brands lose bookings when the path from intent → availability → payment → confirmation is slow, fragmented, or requires users to navigate complex UIs.
- Conversion Friction: Traditional booking flows force users to hunt through filters, rate rules, and forms; drop-off happens before checkout.
- Support Load: Guests ask repetitive questions (“Do you have a double room tomorrow?”, “Is this refundable?”) that agents answer manually.
- Disjointed Systems: Inventory lives in the PMS, payments in a PSP, and the booking UI elsewhere—causing integration, UX, and reliability gaps.
- Brand Rollout Cost: Creating and maintaining multiple branded booking experiences is expensive (design, dev, QA, hosting).
Solution: ChatGPT Hotel Booking App
A conversational, end-to-end booking experience inside ChatGPT.
This app connects ChatGPT to Apaleo (PMS/offers & reservations) and Adyen (payments) using an MCP (Model Context Protocol) server plus modern embedded widgets for a complete booking flow:
Offers → Cart → Payment → Booking Confirmation
Key differentiators:
- Real-time availability & pricing via Apaleo offers
- Secure payment checkout via Adyen Drop-in
- Dynamic guarantee handling (Prepayment / CreditCard / PM6Hold) based on each offer’s minGuaranteeType
- White-label build pipeline to generate per-brand assets/config and a deployable Docker image
How it Works (User Journey + System Flow)
- Guest asks in natural language (e.g., “Show me available rooms in Munich for tomorrow, 1 adult”).
- ChatGPT calls get_offers on the MCP server.
- Apaleo returns offers (availability, price, guarantee type).
- Offers widget renders a carousel of room cards (images + price + key conditions).
- Guest selects a room; the cart/guest form is shown inline in the widget.
- Guest submits guest details (name, email, address, phone).
- ChatGPT calls create_payment_session; backend creates an Adyen session with correct metadata.
- Guest completes payment in Adyen Drop-in.
- Backend finalizes booking in Apaleo (with race-condition protection to prevent duplicates).
- Confirmation widget displays booking details (and optional email confirmation can be sent when configured).
Inputs / Outputs
Inputs
- Search intent: property, dates, adults (via chat)
- Offer selection: chosen offer/rate plan from the offers widget
- Guest data: name, email, phone, address (via cart widget)
- Payment: card / wallet payment in Adyen Drop-in
- Brand config (white-label): colors, logo, supported properties, room images
Outputs
- Room offers UI: real-time priced offers, room images, conditions
- Cart UI: validated guest details entry + summary
- Payment session: Adyen Drop-in session + redirect / embedded checkout page
- Confirmed reservation: booking created in Apaleo PMS
- Booking confirmation UI: confirmation screen with key details
- Operational logs: structured JSON logs for debugging and auditability
Integrations
- ChatGPT (MCP Connector): Chat-driven orchestration calling server tools.
- Apaleo: Offers retrieval + reservation creation (offers.read, reservations.manage, folios.manage).
- Adyen: Payment sessions + webhooks for authorization events.
- Email (optional): API-key based email sending (e.g. Resend) for confirmations.
- Deployment: Docker container + optional nginx reverse proxy and ACME companion for TLS.
Business Value
Value for Guests (Conversion)
- Less friction: conversational search replaces complex filtering.
- Faster time-to-book: fewer clicks, guided flow, clear next step.
- Higher confidence: offer conditions and guarantee type handled correctly.
Value for Hotels / Brands (Revenue + Efficiency)
- Higher conversion rate through reduced UX complexity and guided checkout.
- Lower support cost by deflecting pre-booking questions into self-serve chat.
- Faster brand rollout via white-label builds instead of bespoke frontends.
- Reduced integration risk by standardizing the booking flow around Apaleo + Adyen.
KPI Targets (measure to prove impact)
- Conversion: search→checkout start, checkout start→payment success, payment→booking success
- Time-to-book: median minutes from first message to confirmation
- Drop-off points: offer view → selection, cart → payment, payment → confirmation
- Support deflection: fewer inbound “availability / price / refundability” queries
- Operational reliability: booking duplication rate (target: ~0), webhook error rate, API latency
Why Now
- Guests increasingly expect conversational commerce and instant answers.
- Apaleo + Adyen provide robust APIs; MCP enables safe, tool-based LLM actions.
- White-labeling allows multi-property / multi-brand scaling without multiplying engineering effort.
Limits & Risks
- LLM Misinterpretation: Chat intent may be ambiguous; mitigate with tool schemas + validation and asking clarifying questions in-chat.
- Payment & Compliance:
- PSP checkout stays within Adyen Drop-in, but you must still treat PII carefully.
- Ensure GDPR/DSGVO handling (data retention, access, deletion) and legal review.
- Operational Dependencies: Availability and booking rely on Apaleo uptime and API limits; payments rely on Adyen availability.
- Webhook Reliability: Webhooks must be reachable and verified (HMAC) to avoid missed/forged events.
- Brand Configuration Risk: Incorrect mapping of room images/categories can reduce UX quality; requires content QA.
- Context & Session TTL: Session lifetime is finite; long conversations may need re-validation of availability and prices.
Technical Appendix
Explore the architecture & technical details
High-Level Architecture
End-to-End Booking Sequence
Session & Duplicate-Prevention Model (Conceptual)
White-Label Build & Deploy Pipeline
Deployment Topology (Production)
Notable Implementation Characteristics
- Backend: apaleo_booking_server/ is a Python MCP server (FastMCP + FastAPI + uvicorn).
- Frontend: user-facing UI is the Room Offers widget built from src/apaleo-offers-v2/ into static assets served via pnpm run serve.
Tooling surface (core tools):
- get_offers
- create_payment_session
- check_payment_status
Operational controls:
- Structured JSON logging (LOG_PATH)
- Session TTL (SESSION_TTL_HOURS)
- Booking lock to prevent duplicate reservations