In a recent QOD, it was stated that if a matchplay coupon is restricted to even-money bets, blackjack is a good game to play. What happens if the player is dealt a blackjack? I'm guessing they would get 3-2 on their chip and even money on the match chip. Or would they just get even money on the whole bet?
Good guess!
The standard payout on a matchplay coupon for a natural blackjack is the bonus for the natural, either 3-2 or 6-5, on the base bet. Then you're paid even-money on the coupon.
If your dealer pays the bonus on both the bet and coupon, take it. If he or she tries to pay even money on both, raise a fuss. The way to do that is to call over a floor supervisor, who'll almost certainly know the rule. If not, keep escalating until someone shows up who does.