zammad/config/routes/signature.rb

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

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

end