# File lib/active_merchant/billing/integrations/return.rb, line 20
        def parse(query_string)
          return {} if query_string.blank?
          
          query_string.split('&').inject({}) do |memo, chunk|
            next if chunk.empty?
            key, value = chunk.split('=', 2)
            next if key.empty?
            value = value.nil? ? nil : CGI.unescape(value)
            memo[CGI.unescape(key)] = value
            memo
          end
        end