Allows you to set up a form action (like the standard ones
return, submit, refresh,
etc.). It requires a Perl subroutine as a target:
FormAction foo <<EOR sub { $CGI->{mv_nextpage} = 'bar'; } EOR
If it returns a true (non-zero, non-empty) value, MiniVend will display the page defined in $CGI->{mv_nextpage}. Otherwise, MiniVend will not display any page (assuming you took care of that in your routine).
You can override the default MiniVend actions if you desire.
There is also a catalog-specific version of this directive, which overrides any action of the same name.