Shipments and cancellation ?

shipping carriers -
so if a person has made a order with a shipping carrier and the tracking number status is that it says shipment information only received what does that mean ? and if it shows no details or package etc. being picked up or being processing thru there system can the seller just cancel it if you no longer want to go thru with the order anymore and will they lose any money ? don't you have to actual pay when there is a package or parcel being shipped ?

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