Yes, absolutely. Providing the customs code when selling goods through SPACEGOATS is mandatory for legal reasons. The customs tariff number is needed to verify the applicable VAT rate (19% vs. 7%) and for statistical reporting purposes if the goods are stored in a fulfillment center in Poland, for example.
We kindly ask you to specify the tariff number as accurately as possible. The ideal case would be the 10-digit TARIC-Number, but we need the 6-digit HS-Code (i.e. the first 6 digits of the TARIC-Number), at least.
Information and verification of the code can be found here.