Open - the auction is active and can receive bids.
Frozen - the shipper has accepted a bid and is waiting
for carrier acceptance to fulfil the shipment / service.During this stage,
the auction cannot receive more bids.If the carrier refuses it,
the auction returns to Open.
Closed - when a carrier has accepted the shipper's offer to fulfil the shipment/service described in the auction.
Expired - the auction has reached its time limit,
with or without bids.If an auction is awarded it will stay as Closed.