We always let our Sellers review and complete their due diligence on any potential bidders before accepting them into your auction.
Accepting them as a bidder allows them to bid on your listing and create new, higher bids if their proxy bid is automatically met.
Some Flippa customers choose not to do business with potential bidders if they've not transacted previously on Flippa, if they have poor or nonexistent feedback, the number of disputes they've been involved with, or if they have had a prior poor experience with an individual Flippa customer.
In all cases, you are accepting a bidder, not a particular bid amount. Any bidders accepted whose bids are less than your reserve price will not require you to sell your property to that bidder.