Technologies in use by

Websites that accepts payments with American Express.

nginx [engine x] is a HTTP server and mail proxy server written by Igor Sysoev.

Ruby on Rails is an open-source web framework that is optimized for programmer happiness and sustainable productivity. It lets you write beautiful code by favoring convention over configuration.

The DOCTYPE is a required preamble for HTML5 websites.

Websites using https protocol.

UTF-8 (8-bit UCS/Unicode Transformation Format) is a variable-length character encoding for Unicode. It is the preferred encoding for web pages.