# File lib/active_merchant/billing/credit_card_methods.rb, line 75
        def type?(number)
          return 'bogus' if valid_test_mode_card_number?(number)

          card_companies.reject { |c,p| c == 'maestro' }.each do |company, pattern|
            return company.dup if number =~ pattern 
          end
          
          return 'maestro' if number =~ card_companies['maestro']

          return nil
        end