Identify the courier behind a tracking number (UPS, FedEx, USPS, DHL Express, DPD, Royal Mail and other national posts) from its format, check the check digit where the carrier publishes one, and return the carrier's official tracking link. Several carriers can match the same pattern; each candidate says whether its check digit passed. It does not read live scan events (carriers serve them only through their own sites or keyed APIs).

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