Multi-Market API

Path-based routing API for market and language-specific product discovery with localized content.

Overview

The Multi-Market API provides endpoints for accessing products and configuration data scoped to specific geographical markets and languages. All product endpoints use path-based routing with both market code and language code in the URL path.

Base URL Pattern: /api/{market}/{lang}/...

Key Features:

Case-insensitive market and language codes (ES, es, Es all work)
Language-specific product content via locale
Content from ProductByMarketTranslation (no fallback to template)
Active product filtering with locale matching
Market configuration with supported languages
Structured error responses for invalid/inactive markets

Quick Start

Get Market Products (with language)

curl -X GET "https://api.example.com/api/es/ca/products" \
  -H "Accept: application/json"

Get Single Product by ID

curl -X GET "https://api.example.com/api/es/es/products/10" \
  -H "Accept: application/json"

Get Single Product by Slug

curl -X GET "https://api.example.com/api/es/ca/products/slug/tour-de-barcelona" \
  -H "Accept: application/json"

Get Single Product by SKU

curl -X GET "https://api.example.com/api/es/ca/products/sku/ES-2CMB10-CA1" \
  -H "Accept: application/json"

Get Market Configuration

curl -X GET "https://api.example.com/api/de/config" \
  -H "Accept: application/json"

Endpoints

GET /api/{market}/{lang}/products

List all active products for a market and language with localized content.

Parameters:

Name	In	Type	Required	Description
market	path	string	Yes	Market code (case-insensitive, e.g., “es”, “US”, “De”)
lang	path	string	Yes	Language code (e.g., “en”, “es”, “ca”)

Response: 200 OK

{
  "data": [
    {
      "id": 10,
      "product_template_id": 5,
      "sku": "ES-5CMB10-CA1",
      "locale": "ca_ES",
      "status": "active",
      "sort_order": 0,
      "trip_duration_days": 10,
      "title": "Tour de Sri Lanka",
      "subtitle": "Descobreix l'illa maragda",
      "short_description": "Una aventura increible...",
      "long_description": "Descripció completa del tour...",
      "highlights": ["Sigiriya", "Kandy", "Yala"],
      "destination_info": "Sri Lanka",
      "url_slug": "tour-sri-lanka",
      "hero_image": "https://cdn.example.com/images/sri-lanka.jpg",
      "departure_airports": [
        {
          "iata_code": "BCN",
          "name": "Barcelona-El Prat Airport",
          "city": "Barcelona",
          "country": "Spain"
        }
      ]
    }
  ],
  "meta": {
    "market": "ES",
    "locale": "ca_ES"
  }
}

GET /api/{market}/{lang}/products/{id}

Get a single product by its ProductByMarket ID.

Parameters:

Name	In	Type	Required	Description
market	path	string	Yes	Market code (case-insensitive)
lang	path	string	Yes	Language code
id	path	integer	Yes	ProductByMarket ID

GET /api/{market}/{lang}/products/slug/{slug}

Get a product by its URL slug. First checks translated slug, then falls back to base product template slug.

GET /api/{market}/{lang}/products/sku/{sku}

Get a product by its market-specific SKU code.

SKU Format: <MARKET>-<TEMPLATEID><IATA><DAYS>-<LANG><VERSION>

Example: ES-5CMB10-CA1 = Spain market, template 5, CMB airport, 10 days, Catalan, version 1

GET /api/{market}/{lang}/products/{id}/leading-price

Get the minimum price from active offers for a product. Use this to display “From $XXX” pricing.

Response: 200 OK

{
  "data": {
    "product_by_market_id": 23,
    "price_from": "1249",
    "currency": "EUR",
    "offers_count": 5
  }
}

When no active offers exist, price_from is null and offers_count is 0.

GET /api/{market}/{lang}/products/{id}/preview

Preview a product regardless of status (draft/inactive). Requires a signed URL.

Middleware: signed (Laravel signed URL validation)

Usage: Generate signed URLs via ProductByMarket::generatePreviewUrl(). The frontend accepts this as a base64-encoded preview query parameter.

Token Expiration: 60 minutes (configurable)

Source: backend/app/Http/Controllers/Api/ProductByMarketController.php

GET /api/{market}/config

Get market configuration including locale, currency, timezone, supported languages, and departure airports.

Response: 200 OK

{
  "data": {
    "code": "ES",
    "name": "Spain",
    "locale": "es_ES",
    "supported_languages": ["es", "ca"],
    "tour_path_slugs": { "es": "circuito", "ca": "circuit" },
    "currency": {
      "code": "EUR",
      "name": "Euro"
    },
    "timezone": "Europe/Madrid",
    "departure_airports": [
      {
        "iata_code": "MAD",
        "name": "Adolfo Suarez Madrid-Barajas Airport",
        "city": "Madrid",
        "is_primary": true
      }
    ]
  }
}

Note: tour_path_slugs provides localized URL path segments for product pages (e.g., /es/circuito/product-slug for Spanish, /es/ca/circuit/product-slug for Catalan).

Error Responses

Market Not Found (404)

{
  "success": false,
  "error": "market_not_found",
  "message": "Market 'xyz' not found."
}

Market Inactive (403)

{
  "success": false,
  "error": "market_inactive",
  "message": "Market 'FR' is currently not available."
}

Language Not Supported (400)

{
  "success": false,
  "error": "language_not_supported",
  "message": "Language 'de' is not supported by market 'ES'. Supported languages: es, ca"
}

Architecture

Route Structure

routes/api.php
    |
    v
Route::prefix('{market}')
    ->middleware(['market'])
    ->whereAlpha('market')
    |
    +-- GET /config              -> ProductByMarketController@config
    |
    +-- Route::prefix('{lang}')->whereAlpha('lang')
        |
        +-- GET /products            -> ProductByMarketController@index
        +-- GET /products/{id}       -> ProductByMarketController@show
        +-- GET /products/{id}/leading-price -> ProductByMarketController@leadingPrice
        +-- GET /products/slug/{slug} -> ProductByMarketController@showBySlug
        +-- GET /products/sku/{sku}  -> ProductByMarketController@showBySku
        |
        +-- Route::prefix('checkout')
            +-- GET /{offerId}/flights    -> CheckoutController@flights
            +-- GET /{offerId}/hotels     -> CheckoutController@hotels
            +-- GET /{offerId}/activities -> CheckoutController@activities
            +-- GET /{offerId}/transfers  -> CheckoutController@transfers
            +-- GET /{offerId}/travelers  -> CheckoutController@travelers
            +-- POST /{offerId}/business-flights -> CheckoutController@businessFlights
            |
            +-- Route::middleware('stateful.api')  // Session-based
                +-- POST /{offerId}       -> CheckoutController@start
                +-- GET /                 -> CheckoutController@show
                +-- PUT /flights          -> CheckoutController@updateFlightSelection
                +-- PUT /hotels           -> CheckoutController@updateHotelSelection
                +-- PUT /activities       -> CheckoutController@updateActivitySelection
                +-- PUT /transfers        -> CheckoutController@updateTransferSelection
                +-- PUT /travelers        -> CheckoutController@updateTravelerData

Components

Component	File	Purpose
Controller	`app/Http/Controllers/Api/ProductByMarketController.php`	Handle product requests
Checkout Controller	`app/Http/Controllers/Api/CheckoutController.php`	Handle checkout flow
Checkout Session Service	`app/Services/Checkout/CheckoutSessionService.php`	Manage checkout session state
Checkout Hotel Service	`app/Services/Checkout/CheckoutHotelService.php`	Extract upsell hotel options
Hotel Price Calculator	`app/Services/Checkout/HotelPriceCalculatorService.php`	Calculate upsell price differences
Checkout Transfer Service	`app/Services/Checkout/CheckoutTransferService.php`	Extract transfer options from itineraries
Transfer Price Calculator	`app/Services/Checkout/TransferPriceCalculatorService.php`	Calculate per-trip transfer pricing
Middleware	`app/Http/Middleware/ResolveMarket.php`	Validate market, resolve locale
Product Resource	`app/Http/Resources/ProductByMarketResource.php`	Transform product with translations
Checkout Session Resource	`app/Http/Resources/CheckoutSessionResource.php`	Transform checkout session
Market Resource	`app/Http/Resources/MarketResource.php`	Transform market config

Frontend Integration (JavaScript)

// Fetch products for a market and language
async function getMarketProducts(marketCode, langCode) {
  const response = await fetch(`/api/${marketCode}/${langCode}/products`);

  if (!response.ok) {
    const error = await response.json();
    throw new Error(error.message);
  }

  return response.json();
}

// Get market configuration
async function getMarketConfig(marketCode) {
  const response = await fetch(`/api/${marketCode}/config`);
  return response.json();
}

// Usage
const config = await getMarketConfig('es');
console.log('Supported languages:', config.data.supported_languages);

Performance

Eager Loading

All product queries use eager loading to prevent N+1 queries:

->with(['productTemplate', 'translation', 'departureAirports'])

Database Indexes

-- ProductByMarket queries
INDEX (market_id, status, sort_order)

-- Locale-based lookups
UNIQUE (product_template_id, market_id, locale)

-- Translation lookups
UNIQUE (locale, url_slug)

Checkout Endpoints

Endpoints for the checkout flow, including flight selection and session management.

POST /api/{market}/{lang}/checkout/{offerId}

Start a checkout session for an offer. Overwrites any existing checkout session.

Middleware: stateful.api (requires session cookies)

Response: 201 Created

{
  "success": true,
  "data": {
    "offer_id": 123,
    "started_at": "2026-01-21T10:30:00+00:00",
    "flight_selection": null,
    "base_price": 1699.00,
    "extras_price": 0.00,
    "total_price": 1699.00,
    "currency": {
      "code": "EUR",
      "symbol": "€"
    },
    "pax_count": 2
  }
}

Errors:

404 - Offer not found, inactive, or belongs to different market

GET /api/{market}/{lang}/checkout

Get the current checkout session state.

Middleware: stateful.api (requires session cookies)

Response: 200 OK - Same structure as POST response

Errors:

404 - No active checkout session (error: "no_checkout_session")

Full Session Response Structure:

{
  "success": true,
  "data": {
    "offer_id": 123,
    "started_at": "2026-01-21T10:30:00+00:00",
    "flight_selection": {
      "cabin_class": "BUSINESS",
      "business_extra_price_per_person": 500.00,
      "outbound": { ... },
      "inbound": { ... }
    },
    "hotel_selections": [
      {
        "upsell_hotel_id": 4,
        "nights_start": 1,
        "nights_end": 3,
        "price_difference": 170.29,
        "hotel_name": "Luxury Safari Lodge",
        "location": "Nairobi"
      }
    ],
    "activity_selections": [
      {
        "activity_id": 5,
        "day_number": 2,
        "price": 45.00,
        "activity_name": "Safari Quad Excursion",
        "location": "Nairobi"
      }
    ],
    "transfer_selections": [
      {
        "transfer_id": 8,
        "day_number": 1,
        "price": 120.00,
        "transfer_name": "Private Luxury Transfer",
        "location": "Nairobi"
      }
    ],
    "traveler_data": [...],
    "base_price": 1699.00,
    "extras_price": 335.29,
    "total_price": 2034.29,
    "currency": { "code": "EUR", "symbol": "€" },
    "pax_count": 2
  }
}

Selection Item Fields:

Selection Type	Field	Description
hotel_selections	`upsell_hotel_id`	ID of the upsell hotel
	`nights_start` / `nights_end`	Tour day numbers for this stay
	`price_difference`	Total price for the room upgrade (per room, not per person)
	`hotel_name`	Name of the selected upsell hotel
	`location`	City/location of the hotel
activity_selections	`activity_id`	ID of the activity
	`day_number`	Tour day number
	`price`	Per-person price
	`activity_name`	Name of the activity
	`location`	Destination/location of the activity
transfer_selections	`transfer_id`	ID of the transfer
	`day_number`	Tour day number
	`price`	Per-trip price (flat rate, not per person)
	`transfer_name`	Name of the transfer service
	`location`	Destination/location of the transfer

PUT /api/{market}/{lang}/checkout/flights

Update the flight selection in the current checkout session. Recalculates pricing for business class.

Middleware: stateful.api (requires session cookies)

Request Body:

{
  "cabin_class": "BUSINESS",
  "outbound": {
    "departure_date": "2026-02-15",
    "departure_time": "09:10",
    "arrival_time": "15:15",
    "departure_airport": "MAD",
    "arrival_airport": "NBO",
    "flight_numbers": ["EK123", "EK456"],
    "airlines": ["EK"],
    "stops": 1,
    "stopover_airports": ["DXB"]
  },
  "inbound": {
    "departure_date": "2026-02-22",
    "departure_time": "08:00",
    "arrival_time": "14:30",
    "departure_airport": "NBO",
    "arrival_airport": "MAD",
    "flight_numbers": ["EK789"],
    "airlines": ["EK"],
    "stops": 0,
    "stopover_airports": []
  },
  "business_extra_price_per_person": 500.00
}

Response: 200 OK

{
  "success": true,
  "data": {
    "offer_id": 123,
    "started_at": "2026-01-21T10:30:00+00:00",
    "flight_selection": { ... },
    "base_price": 1699.00,
    "extras_price": 1000.00,
    "total_price": 2699.00,
    "currency": { "code": "EUR", "symbol": "€" },
    "pax_count": 2
  }
}

Price Calculation: extras_price = business_extra_price_per_person × pax_count

Errors:

400 - No checkout session or validation error
Validation: cabin_class must be ECONOMY or BUSINESS, airport codes must be 3 characters

GET /api/{market}/{lang}/checkout/{offerId}/flights

Get available flight options for an offer (from cache).

Response: 200 OK

{
  "success": true,
  "data": {
    "offer_id": 123,
    "tour_name": "Safari Adventure",
    "final_price": 1699.00,
    "cabinClass": "ECONOMY",
    "source_type": "cache",
    "has_flights": true,
    "outbound_options": [...],
    "inbound_options": [...]
  }
}

POST /api/{market}/{lang}/checkout/{offerId}/business-flights

Search for business class flights (live API call). Rate limited to 10 requests/minute.

Response: 200 OK

{
  "success": true,
  "data": {
    "offer_id": 123,
    "tour_name": "Safari Adventure",
    "original_final_price": 1699.00,
    "cabinClass": "BUSINESS",
    "source_type": "live_search",
    "has_flights": true,
    "outbound_options": [
      {
        "id": "fare-abc-outbound-1",
        "finalPrice": 2899.00,
        "extraPrice": 1200.00,
        "departureTime": "10:00",
        "arrivalTime": "22:00",
        "duration": "12h 00min",
        "stops": 0
      }
    ],
    "inbound_options": [...]
  }
}

Price Calculation: finalPrice = (flightPrice + landBasePrice) × (1 + margin/100)

The extraPrice is the difference between the business class final price and the original economy offer price.

GET /api/{market}/{lang}/checkout/{offerId}/hotels

Get upsell hotel options for an offer. Returns hotels that can upgrade the guaranteed (included) hotels.

Response: 200 OK

{
  "success": true,
  "data": {
    "offer_id": 123,
    "offer_sku": "SAFARI-2026",
    "tour_name": "Safari Adventure",
    "final_price": 1699.00,
    "departure_date": "2026-04-20",
    "return_date": "2026-04-27",
    "pax_count": 2,
    "currency": {
      "code": "EUR",
      "symbol": "€"
    },
    "hotels": [
      {
        "id": "4-1-2",
        "hotelId": 4,
        "name": "Luxury Safari Lodge",
        "location": "Nairobi",
        "nights": { "start": 1, "end": 2 },
        "imageUrl": "http://example.com/hotel.jpg",
        "isIncluded": false,
        "priceDifference": 170.29,
        "guaranteedHotelName": "Standard Safari Hotel"
      }
    ]
  }
}

Fields:

Field	Type	Description
`id`	string	Unique key: `{hotelId}-{startDay}-{endDay}`
`hotelId`	int	The actual hotel ID
`priceDifference`	float\|null	Extra cost in EUR, null if pricing unavailable
`guaranteedHotelName`	string\|null	Name of the included hotel being replaced
`nights.start` / `nights.end`	int	Tour day numbers for this stay

Price Calculation:

Looks up per-night rates for both upsell and guaranteed hotels
Uses room type ‘2A’ (2 Adults)
Converts to EUR via exchange rates
Returns null if pricing data is unavailable

Grouping Logic:

Consecutive nights at the same guaranteed hotel are grouped together
Same upsell hotel can appear multiple times for different stays

GET /api/{market}/{lang}/checkout/{offerId}/activities

Get activity options for an offer. Returns included and upsell activities organized by day.

Response: 200 OK

{
  "success": true,
  "data": {
    "offer_id": 123,
    "offer_sku": "SAFARI-2026",
    "tour_name": "Safari Adventure",
    "final_price": 1699.00,
    "price_per_person": 849.50,
    "departure_date": "2026-04-20",
    "return_date": "2026-04-27",
    "pax_count": 2,
    "currency": { "code": "EUR", "symbol": "€" },
    "days": [
      {
        "day_number": 1,
        "destination": "Nairobi",
        "included_activities": [
          { "name": "City Tour" }
        ],
        "available_activities": [
          {
            "id": 5,
            "name": "Safari Quad Excursion",
            "description": "Explore the savanna...",
            "image_url": "http://example.com/activity.jpg",
            "price": 45.00
          }
        ]
      }
    ]
  }
}

Fields:

Field	Type	Description
`included_activities`	array	Activities included in the tour (names only)
`available_activities`	array	Upsell activities available for purchase
`price`	float\|null	Per-person price in EUR, null if unavailable

Price Calculation:

Looks up per-person rates from the activity’s SupplierService
Uses per_person room type for pricing
Converts to EUR via exchange rates
Returns null if pricing data is unavailable

GET /api/{market}/{lang}/checkout/{offerId}/transfers

Get transfer options for an offer. Returns included and upsell transfers organized by day.

Response: 200 OK

{
  "success": true,
  "data": {
    "offer_id": 123,
    "offer_sku": "SAFARI-2026",
    "tour_name": "Safari Adventure",
    "product_url": "/es/circuito/safari-adventure",
    "final_price": 1699.00,
    "price_per_person": 849.50,
    "departure_date": "2026-04-20",
    "return_date": "2026-04-27",
    "pax_count": 2,
    "currency": { "code": "EUR", "symbol": "€" },
    "days": [
      {
        "day_number": 1,
        "destination": "Nairobi",
        "included_transfers": [
          { "name": "Airport Transfer" }
        ],
        "available_transfers": [
          {
            "id": 5,
            "name": "Private Luxury Transfer",
            "description": "Travel in comfort with a private vehicle...",
            "image_url": "http://example.com/transfer.jpg",
            "vehicle_type": "luxury_sedan",
            "duration_minutes": 45,
            "price": 120.00
          }
        ]
      }
    ]
  }
}

Fields:

Field	Type	Description
`included_transfers`	array	Transfers included in the tour (names only)
`available_transfers`	array	Upsell transfers available for purchase
`vehicle_type`	string\|null	Type of vehicle (e.g., luxury_sedan, minivan)
`duration_minutes`	int\|null	Estimated transfer duration
`price`	float\|null	Per-trip price in EUR, null if unavailable

Price Calculation:

Looks up per-trip rates from the transfer’s SupplierService
Uses per_trip room type for pricing (not per-person)
Converts to EUR via exchange rates
Returns null if pricing data is unavailable

Filtering Logic:

Only days with upsell transfers are returned
Days with only included transfers are hidden (nothing to upgrade)

Source: backend/app/Http/Controllers/Api/CheckoutController.php:631

PUT /api/{market}/{lang}/checkout/transfers

Update the transfer selections in the current checkout session.

Middleware: stateful.api (requires session cookies)

Request Body:

{
  "transfer_selections": [
    {
      "transfer_id": 5,
      "day_number": 1
    },
    {
      "transfer_id": 8,
      "day_number": 3
    }
  ]
}

Security Note: Prices are NOT sent from the client - they are calculated server-side based on the transfer’s SupplierService rates.

Response: 200 OK

{
  "success": true,
  "data": {
    "offer_id": 123,
    "started_at": "2026-01-21T10:30:00+00:00",
    "flight_selection": { ... },
    "hotel_selections": [...],
    "activity_selections": [...],
    "transfer_selections": [
      { "transfer_id": 5, "day_number": 1, "price": 120.00, "transfer_name": "Private Luxury Transfer", "location": "Nairobi" },
      { "transfer_id": 8, "day_number": 3, "price": 95.00, "transfer_name": "VIP Airport Pickup", "location": "Mombasa" }
    ],
    "base_price": 1699.00,
    "extras_price": 215.00,
    "total_price": 1914.00,
    "currency": { "code": "EUR", "symbol": "€" },
    "pax_count": 2
  }
}

Price Calculation:

Transfer prices are per-trip (flat rate, NOT multiplied by pax_count)
Unlike activities which are per-person
extras_price = flight_extras + hotel_extras + activity_extras + transfer_extras

Validation:

transfer_id must be a positive integer
day_number must be at least 1
Transfer must exist as an upsell option for the specified day

Errors:

400 - No checkout session (error: "no_checkout_session")
400 - Validation error (missing fields, invalid values)
422 - Transfer not available for specified day

Source: backend/app/Http/Controllers/Api/CheckoutController.php

GET /api/{market}/{lang}/checkout/{offerId}/travelers

Get offer summary for the traveler data entry page. This is simpler than other checkout endpoints since there are no upsell options - only offer metadata.

Response: 200 OK

{
  "success": true,
  "data": {
    "offer_id": 123,
    "offer_sku": "SAFARI-2026",
    "tour_name": "Safari Adventure",
    "product_url": "/es/circuito/safari-adventure",
    "final_price": 1699.00,
    "price_per_person": 849.50,
    "departure_date": "2026-04-20",
    "return_date": "2026-04-27",
    "pax_count": 2,
    "currency": {
      "code": "EUR",
      "symbol": "€"
    }
  }
}

Fields:

Field	Type	Description
`offer_id`	int	The offer ID
`offer_sku`	string	The offer SKU code
`tour_name`	string\|null	Localized tour name from product translation
`product_url`	string\|null	Frontend product page path
`final_price`	float	Total price for all travelers
`price_per_person`	float	Price divided by pax count
`departure_date`	string	Tour start date (Y-m-d format)
`return_date`	string\|null	Tour end date (Y-m-d format)
`pax_count`	int	Number of travelers
`currency`	object	Currency code and symbol

Errors:

404 - Offer not found, inactive, or belongs to different market

Source: backend/app/Http/Controllers/Api/CheckoutController.php:754

PUT /api/{market}/{lang}/checkout/travelers

Update traveler personal data in the current checkout session. Does NOT affect pricing.

Middleware: stateful.api (requires session cookies)

Request Body:

{
  "travelers": [
    {
      "first_name": "John",
      "last_name": "Doe",
      "nationality": "ES",
      "dni": "12345678A",
      "passport_number": null,
      "passport_expiry": null,
      "birth_date": "1990-05-15",
      "phone": "+34612345678",
      "email": "john@example.com"
    },
    {
      "first_name": "Jane",
      "last_name": "Doe",
      "nationality": "ES",
      "dni": null,
      "passport_number": "AB1234567",
      "passport_expiry": "2030-01-01",
      "birth_date": "1992-08-20",
      "phone": "+34612345679",
      "email": "jane@example.com"
    }
  ]
}

Response: 200 OK

{
  "success": true,
  "data": {
    "offer_id": 123,
    "started_at": "2026-01-21T10:30:00+00:00",
    "flight_selection": { ... },
    "hotel_selections": [...],
    "activity_selections": [...],
    "transfer_selections": [...],
    "traveler_data": [
      {
        "first_name": "John",
        "last_name": "Doe",
        "nationality": "ES",
        "dni": "12345678A",
        "passport_number": null,
        "passport_expiry": null,
        "birth_date": "1990-05-15",
        "phone": "+34612345678",
        "email": "john@example.com"
      }
    ],
    "base_price": 1699.00,
    "extras_price": 0.00,
    "total_price": 1699.00,
    "currency": { "code": "EUR", "symbol": "€" },
    "pax_count": 2
  }
}

Traveler Fields:

Field	Type	Required	Description
`first_name`	string	Yes	First name (max 100 chars)
`last_name`	string	Yes	Last name (max 100 chars)
`nationality`	string	Yes	ISO 2-letter country code
`dni`	string	Conditional	National ID document
`passport_number`	string	Conditional	Passport number
`passport_expiry`	date	Conditional	Passport expiry (required if passport_number provided)
`birth_date`	date	Yes	Date of birth (must be in past)
`phone`	string	Yes	Phone number
`email`	string	Yes	Valid email address

Validation Rules:

Number of travelers must match the offer’s pax_count
At least one of dni or passport_number must be provided for each traveler
passport_expiry is required when passport_number is provided
passport_expiry must be a future date
birth_date must be a past date

Pricing:

Traveler data does NOT affect pricing
extras_price and total_price remain unchanged

Errors:

400 - No checkout session (error: "no_checkout_session")
400 - Validation error (pax count mismatch, missing fields, invalid dates)

Source: backend/app/Http/Controllers/Api/CheckoutController.php

Context Logging

The ResolveMarket middleware automatically adds context to all logs:

Context::add('market_code', $market->code);
Context::add('market_id', $market->id);
Context::add('locale', $locale);