Update Line Properties Shopify

update-line-properties.js

    const updates = {}
    
    updates['line'] = cart_line
    updates['quantity'] = quantity
    updates['properties'] = properties

    const response = await fetch("/cart/change.js", {
      method: "POST",
      headers: {
        "Content-Type": "application/json",
        "Accept": "application/json",
      },
      body: JSON.stringify(updates),
    });

    const data = await response.json()

    console.log(data)