WordPress Backend Developer for Airport Booking

**PROJECT TITLE**

WordPress Backend Developer for Airport Booking Platform – Flights & Parking

**PROJECT DESCRIPTION**

We are looking for an experienced WordPress Backend Developer to build the backend of an airport booking platform covering both flight ticket booking and airport parking.

This is **Phase 1 – Backend/API only**. No theme, front-end design, Elementor, WPBakery, or ready-made travel theme is required. The website and mobile app will be developed in Phase 2 on top of the API created in this phase.

### 1. FLIGHT TICKET BOOKING

The flight module must include:

* Integration with one flight API such as Amadeus, Duffel, or Travelpayouts
* One-way, round-trip, and multi-city flight search
* Cabin class selection
* Passenger types
* Admin markup rules using percentage or flat amounts
* Markup rules by route, airline, and cabin class
* Passenger and passport information
* Flight booking
* PNR storage
* Cancellation and refund handling

The developer should clearly explain which flight API they recommend and why.

### 2. AIRPORT PARKING

The parking module must include:

* Airports
* Terminals
* Parking lots
* Parking capacity management
* Real-time availability based on overlapping date/time ranges
* Daily and hourly pricing
* Peak-period surcharges
* Long-stay discounts
* Parking reservations
* Booking amendments with automatic price difference calculation
* Cancellation policies
* Check-in and check-out management

Availability must be calculated using overlapping booking date/time ranges rather than a simple per-day counter.

### 3. SHARED PLATFORM FEATURES

The backend should also include:

* Customer accounts
* Guest bookings
* Booking history
* Stripe integration
* PayPal integration
* Payment webhooks
* Full and partial refunds
* Multi-currency support
* Coupons
* Email templates
* PDF flight e-tickets
* PDF parking vouchers
* Admin dashboard
* Booking management
* Revenue reporting
* Parking occupancy reporting
* API logs
* User roles including Admin, Manager, Support Agent, Parking Staff, and Customer

### 4. TECHNICAL REQUIREMENTS

The solution must be developed as a **custom WordPress plugin**.

Requirements:

* PHP 8.1+
* WordPress Coding Standards
* Custom database tables
* Proper database indexes
* Versioned REST API using `/wp-json/airport/v1/`
* Postman collection or OpenAPI documentation
* Source code committed directly to our Git repository
* Commit-by-commit development
* Staging server for testing
* Sandbox API/payment mode first
* Production API credentials only after successful sandbox testing
* 30 days of free bug fixing after delivery

No Elementor, WPBakery, or ready-made travel theme should be used.

### 5. MILESTONES

**M1 – Schema & Plugin Foundation**

* Database schema
* Custom plugin foundation
* User roles
* Settings

**M2 – Parking Module**

* Airports, terminals, lots
* Capacity and overlapping availability
* Pricing
* Booking and amendments
* Cancellation
* Check-in/out

**M3 – Flight Module**

* Flight API integration
* Search
* Passenger information
* Sandbox booking flow
* PNR and cancellation/refund handling

**M4 – Payments, Emails & Reports**

* Stripe
* PayPal
* Webhooks
* Refunds
* Emails
* PDF documents
* Reports

**M5 – REST API, Documentation & Handover**

* Versioned REST API
* Postman/OpenAPI documentation
* Testing
* Final handover

### IMPORTANT – PLEASE ANSWER THESE QUESTIONS IN YOUR PROPOSAL

Applications that do not answer all five questions may be skipped.

1. Which flight API would you use (Amadeus, Duffel, Travelpayouts, or another), and why? Please describe where you have integrated this API before.

2. Please provide a link to at least one WordPress plugin you have personally developed. We want to review the code/work.

3. How would you calculate airport parking availability when multiple bookings overlap the same date/time range?

4. What would your system do if the customer's payment succeeds but the flight/parking supplier booking fails?

5. Please provide your estimated timeline for each milestone and your total fixed project price.

All milestone payments will be handled through Freelancer.com escrow.

If Phase 1 is completed successfully, Phase 2 for the website and mobile application will be considered for the same developer.