deminimus

Inject small, conditional fees into the cart at checkout — EU low-value customs duty, carrier handling passthroughs, per-classification surcharges. Configured per rule, runs on Shopify's edge.

• EU €3-per-HS-code duty (live 2026-07-01). Adds the EU low-value customs fee as a separate cart line, scaled to unique HS-6 codes.
• Carrier handling passthroughs. Inject a flat per-order fee for APC, DHL, USPS, or any other carrier surcharge — currency-aware, country-gated.
• Zero external infrastructure. Rules live in your shop's metafields, the function runs on Shopify's edge, no merchant data leaves your store.