class Github::Client::Repos::PubSubHubbub

def subscribe_service(*args)
  params   = arguments(args, required: [:user, :repo, :service]).params
  event    = params.delete('event') || 'push'
  topic    = "#{site}/#{arguments.user}/#{arguments.repo}/events/#{event}"
  callback = "github://#{arguments.service}?#{params.serialize}"
  subscribe(topic, callback)
end