+ <li>Set the <a href="../config/config.cgi#unclassified"><i>signup_server-default_refnum</i></a> configuration value to a default <a href="../browse/part_referral.cgi">advertising source</a>.
+ <li>Set the <a href="../config/config.cgi#unclassified"><i>signup_server-payby</i></a> configuration value to the acceptable payment types for signups.
+ <li>Set the <a href="../config/config.cgi#unclassified"><i>signup_server-realtime</i></a> configuration value to run billing for signups immediately.