Happy-Post (IMX) Tracking. Free & Online.

IMX France documents web services for its clients to announce parcels and print labels. Its public per-parcel tracking needs no login and so, the documentation says, carries no confidential details such as recipients' names and addresses. A local partner delivers each parcel; the documentation gives Colissimo as an example.

TrackParcel reads that public tracking in its JSON form, meant for automated use. The partner's own tracking, the logged-in client site and the sender's order reference stay out of it.

IMX's own parcel number has seven or eight digits and comes back to the client when it announces the parcel through IMX's web service. A parcel can also be found by the four-letter prefix IMX gives each client plus the client's own reference, though the documentation advises against it when references may repeat.

TrackParcel strips spaces, hyphens and underscores and capitalises letters first, so a reference containing them is sent without them. After the four letters it sends 4 to 30 letters and digits. Auto-Detect never looks either shape up here, so pick Happy-Post (IMX) in the courier list.

For each parcel IMX returns its latest label, status code and time, plus every event newest first. TrackParcel shows each event's label and time, uses the parcel's own latest label as the headline unless code cz or cd, or delivery wording under an unlisted code, sets Delivered or Out for Delivery, and still shows a parcel with no events yet as one step.

TrackParcel never reads the sender's reference, the partner's free-text descriptions and codes, or IMX's summary block with the partner's tracking link. Its reading of a found parcel follows the example in IMX's documentation, because no real IMX parcel has been checked.

IMX answers an unknown or malformed number with a reply holding only the warning invalid ID, which TrackParcel turns into not found. Being sent to the login page, a maintenance notice or any unexpected reply counts as a fault or an outage at IMX instead.

IMX's documentation says tracking starts as soon as the parcel is declared to IMX. If a number is still unknown, ask the sender for the IMX number, or for the client code and reference they used.

IMX's status table lists three Remise distributeur local codes after Départ IMX, then codes such as En cours de livraison and Livré. Its documentation warns that, for an international parcel, the final distributor may learn of it only after it crosses the border, so that partner's tracking may call it unknown for a while.

IMX builds its tracking links for senders to pass to their customers, so the sender is your first contact; quote the IMX number, or the client code and reference. A sender's link can forward to the partner's site once IMX knows the partner's first scan.