Once you have placed a bet on an event and someone else places a bet on the other side of the same
event then the bet gets matched. (It gets matched only when you place a lay bet, and another
player places a back bet on the same event or vice versa).
When the event finishes, then these matched bets will get settled based on the results of
that event. When the bet is settled, you will get the payout accordingly (depending on if you won
or lost the bet).
Also, note that if you place a bet using a promotion, and your bet wins then you get the same
bonus back along with the payout from settlement.