.addCustomItemsToCart() runs every time I open my cart

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1

I’ve been trying to set my store up in a way that charges my clients an extra $10 whenever they customize products by adding custom text, so I’ve added the following function to my Cart page:

import wixStores from 'wix-stores';

const customization =
 [{
        name: "Customization fee",
        price: 10,
        quantity: 1,
        note: "Each customized product costs $10 extra!"
 },
 ]

wixStores.addCustomItemsToCart(customization)
 .then((updatedCart) => {
 const cartId = updatedCart._id
 const updatedLineItems = updatedCart.lineItems
 })

The problem is, every time I go into the Cart page, the function starts running and their total is increased by 10. So if they buy 1 product, but then enter the Cart page three times, they’ll end up paying for 30 extra.
Also, I haven’t managed to make it so that only custom items receive the added fee, as non-customized items still end up costing extra. Can someone help me out?

2

You can use the new cart API - closeMiniCart feature immediately when item added

3

You have to check the item exists or not by getCurrentCart. If the item really not added, run the add custom item to vart

4

Can you please give me a more in-depth explanation? Thanks in advance!