All match markets are based on the result at the end of the regular time. This includes any added injury or stoppage time but does not include extra time, time allocated for a penalty shootout or a golden goal.
Unless the bet terms express otherwise, overtime is part of the wager. This is standard practice at a sports betting site, and they'll spell out the terms specifically in their rules and elsewhere on their apps.
Yes, you can use Betfair in the USA.\n\n Therefore, US residents that live outside the particular state, would need to use a VPN, like Atlas VPN, to change their IP to the New Jerseyan one.
Photo identity document\n\n This must show proof of name and age: e.g. photocopy of your driving licence, passport, national ID card or equivalent Government-issued identity document.