Add cars to a Billing Account
Adds one or more cars to the billing account by license number.
Returns HTTP 204 with no response body if all cars were added successfully, or HTTP 207 if
one or more items failed. Check the failures field for any cars that could not be added.
Cars not present in failures were successfully added.
A request may carry at most 50 cars. A larger request is refused with HTTP 400 and none of its cars is added.
A partner in the US writes each car as <state>_<license number>, for example NY_ABC123. The state
is required, is not case sensitive, and has to exist in the US. Other partners send the
license number alone, and special characters in it are ignored. A failure identifies the car by the value
that was sent.
On a billing account that is billed per car, an added car is billed at the monthly per-car price from the next bill run. Adding a car that is already on the account succeeds without change.