BidSpotter.com is free to use and we do not charge anything to our bidders.
Once each auction finishes and is reconciled, the winners will receive a "Winners Notification" and/or an invoice by email from the auctioneer. This should contain information on all of the lots they've won... as well as all of the information they need in regards to arranging payment, lot removal, and perhaps even shipping. Depending on the event, this may come from within moments after the conclusion or may not be sent until the next business day.
To see about expediting the invoicing process, you will need to contact the auctioneer directly.