[User]
lookup_uri = something

##</code><code>##

package App;
our %config = ();
&init;
sub init {
    # loads your configuration file/parameters here and
    # assigns to %App::config
}

package User;

sub new {
    my $self = {};
    bless $self;
    $self->{lookup_uri} = $App::config{lookup_uri};
}