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$external_structure = {
    'name' => 'Test product',
...
                                 }
               }
        };

my $internal_structure = {};

...
$internal_structure->{'qty'} = $external_structure->{'data'}->{'unit_i
+nfo'}->{'qty'};
# etc...

product_id;id
price_excl_vat;data#price
qty;data#unit_info#qty