cf.rb

#!/usr/bin/env ruby

require 'sinatra'
require 'oj'

Oj.default_options = {
  mode: :compat
}

post '/client/v4/zones/:zone_id/purge_cache' do
  content_type 'application/json'
  Oj.dump(
    success: true,
    errors: [],
    messages: [],
    result: {
      id: '9a7806061c88ada191ed06f989cc3dac'
    }
  )
end