FAQ
Does it work with Multi-Vendor?
Section titled “Does it work with Multi-Vendor?”Yes. Each vendor shipment is its own parcel; the vendor’s company country is the ship-from country unless a product says otherwise. Vendors fill in the customs fields in the product form.
Which CS-Cart versions are supported?
Section titled “Which CS-Cart versions are supported?”4.17.2 to 4.21.x.
Does it calculate the exact customs duty?
Section titled “Does it calculate the exact customs duty?”No. It estimates from the rates you maintain (rule amounts and optional HS duty rates). Customs decides the final amount at import. The add-on is not customs, tax or legal advice: check the current rules with the customs authority or a customs broker.
Do I need a paid tariff or customs API?
Section titled “Do I need a paid tariff or customs API?”No. There is no external call. The Rules tab links to the official tariff look-ups (EU TARIC, UK Trade Tariff, US HTS) so you can read the rate and enter it.
What is the difference between DDP and DAP?
Section titled “What is the difference between DDP and DAP?”DDP (delivered duty paid): the estimate is added to the order total and you handle duties and fees. DAP (delivered at place): the estimate is only shown, and the customer pays the carrier or customs on delivery. It is a setting per rule.
Is the EUR 2 handling fee per item or per parcel?
Section titled “Is the EUR 2 handling fee per item or per parcel?”The European Commission’s customs reform page confirms the fee from 1 November 2026 but does not say which unit it counts. The add-on counts per customs item by default; if the legal text you rely on says per parcel, move the amount to “Fee per parcel” on the rule.
Does it file my IOSS return or charge IOSS VAT?
Section titled “Does it file my IOSS return or charge IOSS VAT?”No. VAT comes from your CS-Cart tax rates (or the optional VAT % of a rule). The add-on prints your IOSS, UK VAT and EORI numbers on the documents and keeps the customs data you need for the return.
Will it slow down my store?
Section titled “Will it slow down my store?”No. It runs a few small queries when a cart is calculated and prints nothing on cached pages. The estimate shows on the cart, checkout and order pages only.
How do I get updates?
Section titled “How do I get updates?”Install the new package over the old one. See Installation.
How do I get support?
Section titled “How do I get support?”Contact us through https://cs-cart.kaviolabs.com.
Still stuck?
Section titled “Still stuck?”Work through the troubleshooting guide, then contact support with your CS-Cart version, edition, PHP version and the add-on version (1.0.0).