These functions interface the CCVS API, allowing you to work
     directly with CCVS from your PHP scripts.  CCVS is RedHat's solution to the "middle-man"
     in credit card processing.  It lets you directly address the
     credit card clearing houses via your *nix box and a modem.  Using
     the CCVS module for PHP, you can process credit cards directly
     through CCVS via your PHP Scripts.  The following references will
     outline the process.
    
Note: 
      CCVS has been discontinued by Red Hat and there are no plans
      to issue further keys or support contracts. Those looking for a 
      replacement can consider 
      MCVE by Main Street Softworks
      as a potential replacement. It is similar in design and has documented
      PHP support!
     
      This extension has been removed from PHP and is no
      longer available as of PHP 4.3.0. If you want to use credit card
      processing features you can use MCVE
      instead.
     
  To enable CCVS Support in PHP, first verify your CCVS installation
  directory.  You will then need to configure PHP with the --with-ccvs option. If you use this
  option without specifying the path to your CCVS installation, PHP
  will attempt to look in the default CCVS Install location
  (/usr/local/ccvs). If CCVS is in a non-standard location,
  run configure with: --with-ccvs=[DIR], where
  DIR is the path to your CCVS installation. Please note that CCVS support
  requires that DIR/lib and DIR/include exist, and include
  cv_api.h under the include directory and
  libccvs.a under the lib directory.
 
  Additionally, a ccvsd process will need to be running for the configurations
  you intend to use in your PHP scripts. You will also need to make sure the PHP
  Processes are running under the same user as your CCVS was installed as (e.g.
  if you installed CCVS as user 'ccvs', your PHP processes must run as 'ccvs' as
  well.)