Not my border, so this is the freight side, not EU law. The bill follows the name on the import declaration, not the Incoterm. On a DAP parcel that name is usually the carrier, lodging as your indirect representative, and the published notes put the fee on that person during the transition, never on your customer. The carrier pays and invoices whoever its contract names. Read those terms before November. If they bill the door, your customer pays anyway, as a delivery charge with your name on the box.
Karim has the debtor right, so here is the plumbing under it. Nobody types the item count. It is computed from the tariff classification and origin on each line the carrier declares, and those values come from the data you send it. If your feed just says homeware, somebody at the carrier fills the code in, and your vase, mugs and runner become one fee or three depending on that guess. Send a code and an origin per product, and ask the carrier to show you its count before November.
