RainbowPayPress requires:


    Client-side environment:

     * Generic web browser with HTML5 support.
     * JavaScript enabled in the web browser.


    Server-side environment:

     * PHP version >= 5.4
     * PHP cURL support enabled (Install module 'php-curl' on Debian / Ubuntu)
     * PHP multibyte string support enabled (Install module 'mb-string' on Debian / Ubuntu)
     * Proper Mail Transfer Agent (MTA) configuration for notification emails.
     * WordPress version >= 3.8.3
