To avoid overpayment or underpayment of duties, wrongful usage of free trade agreements, and audit referrals and steep penalties from U.S. Customs and Border Protection (CBP), you want to avoid HTS code issues. You can do this by providing the correct HTS codes (ecommerce brands are generally responsible for providing HTS codes because they import the items) using the Customs Rulings Online Search System (CROSS) database.
Finding the proper HTS code for each SKU can be tedious. You can leverage a third-party logistics company to help you automate this process.