Wix Stores: Prevent Checkout if over a certain quantity

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, ,
1

My store sells products of 3 different categories. I want to prevent checkout if there are either:

  1. More than 5 items of a certain category

OR

 2. More than 4Liters shipping weight of a certain category

OR

 3. More than $200 in subtotal (pre-tax) for a certain category

I added the following code but it returns with a “Cart not found” when I run it.

Cart.jsw

import wixStores from ‘wix-stores-backend’;

export function getCurrentCart() {
const cart = wixStores.getCurrentCart()
return cart;
}

Cart page

import wixWindow from ‘wix-window’;
import { getCurrentCart } from ‘backend/cart.jsw’;

const MAXIMUM_AMOUNT = 200;

$w.onReady( function () {
checkMaxAmount();
});

async function checkMaxAmount() {
let cart = await getCurrentCart();
if (cart.totals.subtotal > MAXIMUM_AMOUNT) {
wixWindow.openLightbox(‘Maximum Order Notification’);
}
}

I’m not JS proficient so any help would be appreciated.
Thanks