zammad/config/routes/tag.rb

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

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

end