zammad/config/routes/group.rb

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

  # groups
  match api_path + '/groups',                     :to => 'groups#index',  :via => :get
  match api_path + '/groups/:id',                 :to => 'groups#show',   :via => :get
  match api_path + '/groups',                     :to => 'groups#create', :via => :post
  match api_path + '/groups/:id',                 :to => 'groups#update', :via => :put

end