v4.0.0 (2014-06-24)

Update HTTP Status Code, do take note of the update of meta.code - Check meta codes here
You can specify multiple slug in array for carrier detectionPOST /couriers/detect
POST /trackings
New required_fields added for some carriers:
POST /trackings
GET /trackings/:slug/:tracking_number
Return required_fields for carriersGET /couriers/all
GET /couriers
New resource to get list of activated couriersGET /couriers
Update method to get full list of all couriers
v3 method is GET /couriers
GET /couriers/all
Update method to get matched courier of tracking number
v3 method as GET /couriers/detect/:tracking_number
POST /couriers/detect