zammad/config/routes/link.rb

Zammad::Application.routes.draw do
  api_path = Rails.configuration.api_path

  # links
  match api_path + '/links',             :to => 'links#index',   :via => :get
  match api_path + '/links/add',         :to => 'links#add',     :via => :get
  match api_path + '/links/remove',      :to => 'links#remove',  :via => :get

end