Car constants

Request

This endpoint returns localised car rental constants used across the Cars API collection, such as extras, fuel policies, payment timings, and transmission types.

It also returns customer service contact email addresses per requested language for partner support scenarios where Booking.com handles travellers' communication directly. To retrieve all constants, send an empty request body.

Security

BearerAuth

X-Affiliate-Idintegerrequired

Include here your Affiliate identifier number

Bodyapplication/json

constantsArray of strings

Use this field to limit the response to specific categories, such as fuel_policies, depot_services, customer_services, etc. If omitted, all constants are returned.

Items Enum Value	Description
car_categories	Vehicle categories used to group rental cars by size and type, such as economy, SUV, or premium.
customer_services	Customer support contact details per language.
depot_services	Services available at the car pick-up location.
depot_types	Types of car rental locations, such as airport, downtown, or train station.
extras	Optional add-ons such as child seats, GPS, or winter equipment.
special_offers	Included benefits or promotions bundled with the rental.
fuel_policies	Fuel handling policies for the rental.
fuel_types	Types of fuel supported by the vehicle.
general	General attributes and labels used across the Cars API.
payment_timings	When the traveller is charged for the booking.
protection_levels	Levels of insurance or protection coverage applied to the rental, affecting the traveller's financial liability.
review_scores	Categories used to evaluate customer reviews of rental experiences, such as cleanliness or pick-up speed.
transmission	Vehicle transmission types.

languagesArray of strings

List of language codes used to localise constant names. Each constant name is returned as a translated object keyed by language. If not provided, en-gb is used by default.

Default:["en-gb"]

curl -i -X POST \
  https://demandapi.booking.com/3.2/cars/constants \
  -H 'Authorization: Bearer <YOUR_string_HERE>' \
  -H 'Content-Type: application/json' \
  -H 'X-Affiliate-Id: 0' \
  -d '{
    "languages": [
      "de",
      "en-gb"
    ]
  }'

Responses

Successful response.

Bodyapplication/json

request_idstring(requestId)

Uniquely identifies the request. Please provide this identifier when contacting support.

dataobject(ConstantsDataOutput)

Contains constant groups keyed by constant type. Each group includes a list of constant identifiers and their translated names.

Response

{
  "request_id": "01jpvx9va93ghgwxq7zypagvdr",
  "data": {
    "car_categories": [ … ],
    "customer_services": [ … ],
    "depot_services": [ … ],
    "depot_types": [ … ],
    "extras": [ … ],
    "special_offers": [ … ],
    "fuel_policies": [ … ],
    "fuel_types": [ … ],
    "general": [ … ],
    "payment_timings": [ … ],
    "protection_levels": [ … ],
    "review_scores": [ … ],
    "transmission": [ … ]
  }
}

Car constants

Request

Headers

Responses