```ruby
module Pesapal
  require 'order_url'
end
```

Revert "Put classes in a separate files"
user
```ruby
module Pesapal
  class OrderUrl

    require 'oauth'
    require 'uri'
    require 'active_support/core_ext/object/to_query'
    require 'htmlentities'

    attr_reader :post_data_xml, :callback_url, :token, :test

    HTTP_METHOD = 'get'
    API_ACTION = '/API/PostPesapalDirectOrderV4'

    def initialize(post_data_xml, callback_url, test=true)
      @post_data_xml   = post_data_xml
      @callback_url    = callback_url
      @token           = nil
      @test            = test
    end

    def api_domain
      test ? 'http://demo.pesapal.com' : 'https://www.pesapal.com'
    end

    def url
      "#{api_domain}#{signed_request.path}"
    end

    def consumer
      @consumer ||= begin
        OAuth::Consumer.new(consumer_key, consumer_secret, {
            site: api_domain,
            http_method: HTTP_METHOD,
            scheme: :query_string
        })
      end
    end

    def consumer_key
      Rails.application.secrets.pesapal_consumer_key
    end

    def consumer_secret
      Rails.application.secrets.pesapal_consumer_secret
    end

    def signed_request
      consumer.create_signed_request HTTP_METHOD, request_url, nil, {}, params
    end

    def request_url
      API_ACTION + "?" + params_to_string
    end


    def params
      @params ||= {
          'oauth_callback'       => callback_url,
          'pesapal_request_data' => escaped_xml,
      }
    end

    def params_to_string
      strings = []
      params.each do |key, value|
        strings << "#{key}=#{CGI::escape(value)}"
      end
      strings.join('&')
    end

    def escaped_xml
      HTMLEntities.new.encode(post_data_xml)
    end
  end
end
```
assistant