Auction on the forum

There is a forum ips.board 3.4.5 that has an auction section. You need to add a field for each user with his maximum bet on the lot (it is not visible to anyone). When someone interrupts the current bid, then the comparison is made with the maximum rates of users and automatically, without the user’s participation, place a bet in the topic while the auction is taking place with the steps indicated in the auction.