I am having trouble updating my cart through JS body input. I want to update the cart based on a customer input into a text field. The customEngraving variable is pricing for a product I have already created on Ecwid and each index translates to a price point. I am new to the Ecwid API so any help would be greatly appreciated.

Ecwid.OnAPILoaded.add(function(page) {
var customEngraving = [0,0,0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13,14,14,15,15,16,16,17,17]
var customInput = document.querySelector(‘CSSSelector’);

if (customInput) {
    customInput.addEventListener('input', async function() {
        try {
            
            var engravingProduct=await getEngravingProduct();
            const items = Ecwid.Cart.get().items;
            // if there is an engraving in the cart, remove it
            for (let i=0; i<items.length; i++) {
                if (items[i]['id']=='207127971') {
                    Ecwid.Cart.removeProduct(i);
                    break;
                }
            }

            // add engraving to cart
            const ind=customEngraving[customInput.length];
            var charCount=engravingProduct['options'][2]['choices'][ind];
            engravingProduct['options'][2]['choices']=charCount;
            Ecwid.Cart.addProduct(engravingProduct);

        } catch (error) {console.error('Error processing input:', error);}
    });
}

});

async function getEngravingProduct() {
const options = {
method: ‘GET’,
headers: {accept: ‘application/json’, Authorization: ‘MyToken’}
};

  try { 
    const response = await fetch('url', options)
    const obj = await response.json();
    return obj;
  
} catch (error) {
  console.log(error);
  throw error;
}  

}

I have made sure that the getEngravingProduct() function works as well as the section where the correct product is being added to the cart. I think I might be getting tripped up by the Ecwid syntax, but any and all help is appreciated.