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How do I validate potential Fedex tracking numbers, without hitting a web service? I've heard Fedex employs a modified version of the Luhn algorithm.
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Essentially, FedEx takes a number of attributes from your delivery (like the size of your parcel; its destination and route) and uses these to create muzak. So, the heavier your parcel is, the more frenetic the drumbeat; and if it's traveling by plane rather than road, it gets a faster BPM, and so on and so on.
FedEx has a powerful advanced information system where we upload data about your shipment as it moves through our network. All you need is the 12-digit package tracking number.
Here's how it works. Scammers send a text message with a fake shipment tracking code and a link to update your delivery preferences. In this case, the message says it's from FedEx. But they might use the name of another well-known shipping company, or the good old U.S. Postal Service.
If a shipment includes many individual pieces, FedEx assigns each parcel a tracking number, but makes one of those the “master tracking number.” You can use that number to track all associated pieces of the shipment.
Check the google answer. There are different algorithm for ground and express.
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