v4.0.3 (2020-03-23)

UpdateResources
New field first_attempted_at added in tracking object.
Time of the first delivery attempt made by the carrier.
GET /trackings/:id
New field courier_tracking_link added in tracking object.
Courier website direct tracking URL
GET /trackings/:id
New field raw_tag added in checkpoint object.
Status code returned by carriers
GET /trackings/:id