Ask for an Atletiekunie club and membership number.
The Royal Dutch Athletics Federation (in Dutch: Koninklijke Nederlandse Atletiek Unie or Atletiekunie) is the governing body for the sport of athletics in the Netherlands. More than 300 athletics and running associations in the Netherlands are affiliated with this federation. If you organize a running event with Atleta you can ask for a club and membership ID to check whether the participant has a valid competition license. In addition you can give a discount to Atletiekunie members or make a membership ID mandatory.
How does it work?