His first career win came at the Azlan Shah Cup Tournament in Malaysia against Belgium (4–3, extra-time) in 2008.

Carter currently has 122 international caps and has represented Canada at the 2009 Pan American Cup, 2010 World Cup, 2010 Commonwealth Games, and 2011 Pan American Games, alongside various other international competitions.

At the event, Canada defeated New Zealand in a 14-round shootout after regulation time ended 0-0, where Carter was called upon to make multiple saves in the quarterfinal matchup.

He then achieved a silver medal in the 2015 Pan American Games in Toronto and was nominated for FIH Goalie of the Year.

In 2015, he was named Field Hockey Canada Player of the Year and another selection to the Pan American Elite Team.