The classic way to do this is to export those variables via Exporter.

Another, easier (tidier) way is to do so using Exporter::Tidy. That way, you get to export the lexical so that in your module you don't have the overhead that package global variables normally have.

package Foo;
use Exporter::Tidy _map => { '$foo' => \my $foo };

$foo = 3;
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And then, in the code that uses the package, unchanged:

use Foo qw($foo);
print $foo;
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Juerd # { site => 'juerd.nl', plp_site => 'plp.juerd.nl', do_not_use => 'spamtrap' }