Deep-deep linking
It allows partners (who have security_token) to generate a link to the checkout form with the fields filled by performing a get-query with parameters. It is used for upselling transfers after selling an air ticket, hotel, etc. without being integrated.

The partner executes an API-request, indicating the client's data, information about the transfer, the number of passengers, the date/time of the transfer, and in return receives a URL to which the client can be redirected.

The client, following the link, gets to the filled checkout form on the Kiwitaxi website of the corresponding locale.If any parameter is not transferred, the corresponding field is not filled.
Tech info
API function /services/build_checkout_link

method of parameter transfer = GET

Format:
/services/build_checkout_link?transfer_id=<_>&security_token=<security_token>&address_from=...&address_to=...&client_email=...&passenger_count=...&locale=...

Security_token must be used for the request to be executed.
List of available parameters
Example of the generated link
to the booking