Aside from being a regular in the Bundesliga he refereed during the 2012-2013 Union of European Football Associations Europa League as well as the 2013 Union of European Football Associations European Under-19 Football Championship. Zwayer was one of Robert Hoyzer"s linesmen for a match that was later implicated as part of the.
On 15 October 2013, Zwayer refereed the 2014 Fédération internationale de football association World Cup qualification match between Lithuania and Bosnia and Herzegovina national football team in Kaunas. By winning 0-1, Bosnia and Herzegovina won the Group G in front of Greece for their first appearance in the Fédération internationale de football association World Cup.
