Yes, it's possible. One way is to use symbolic references:

foreach my $auth (@auth_methods) {
    no strict 'refs';
    my $rv = &{$auth . "::authorize"}($user, $pass);
    ...
}
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In a OO world it would look like this:

foreach my $auth (@auth_methods) {
    my $obj = $auth->new;
    my $rv = $obj->authorize($user, $pass);
    ...
}
[download]