I added an additional fees plugin and it doesn't show any values

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The code I am using seems to bee working but it doesn’t show it in the frontend. What can I do?

Here the code:

import { cart } from ‘wix-ecom-backend’;

export function calculateAdditionalFees(context) {
console.log(“PFAND: context keys:”, Object.keys(context));

if (context.lineItems && context.lineItems.length > 0) {
    console.log("PFAND: Items aus context:", context.lineItems.length);
    return { additionalFees: berechnePfand(context.lineItems) };
} else {
    console.log("PFAND: Keine Items im context, hole Warenkorb...");
    return cart.getCurrentCart()
        .then(currentCart => {
            if (currentCart.lineItems && currentCart.lineItems.length > 0) {
                console.log("PFAND: Items aus getCurrentCart():", currentCart.lineItems.length);
                return { additionalFees: berechnePfand(currentCart.lineItems) };
            } else {
                console.log("PFAND: Warenkorb leer, keine Zusatzgebühr");
                return { additionalFees: [] };
            }
        });
}

}

function berechnePfand(lineItems) {
const pfandKeyword = “PANEDA”;
const pfandBetragProStück = 0.25;

const pfandItems = lineItems.filter(item =>
    (item.productName || "").toLowerCase().includes(pfandKeyword.toLowerCase())
);

console.log(`PFAND: Gefundene Pfand-Produkte: ${pfandItems.length}`);

if (pfandItems.length === 0) {
    return [];
}

const totalPfand = pfandItems.reduce((sum, item) => {
    const qty = item.quantity || 1;
    return sum + (qty * pfandBetragProStück);
}, 0);

console.log(`PFAND: Berechneter Pfandbetrag: ${totalPfand.toFixed(2)} €`);

// price als String (korrektes Format für Wix additionalFees)
return [
    {
        name: "Dosenpfand",
        price: totalPfand.toFixed(2)  // String, z.B. "0.75"
    }
];

}

Working in
Wix Studio Editor

What I’m trying to do
is add an additional fee for refund for cans.

**What do I need to do in order to see the additional fee in the cart in the frontend?

Thanks in advance!**