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# untested:
my @urls;
...
    push @urls, $hash{$outer}->{$inner}->{url};
  }
}

for my $outer ( keys %hash ) {
    for my $inner ( keys %{ $hash{$outer} } ) {
        push @urls, map { $_->{url} }  @{ $hash{$outer}->{$inner} }
    }
}