Typical bidding rules….
By bidding, you are stating that you are ready and willing to purchase that item for your bid amount, plus any shipping charges disclosed in the listing. If you are outbid, or your bid does not meet the seller's reserve price, you are under no obligation to buy. But in all other cases, you are entering a contract with the seller to buy the item, and to deliver payment within the time period specified. If you can't pay, on time, don't bid!