Add Item to Cart and add attachments.js

var getCartItem = function (sys_id) {
    var gr = new GlideRecord("sc_cart_item");
    gr.get(sys_id);
    return gr;
};

var addAttToCartItems = function (items,cat_item) {
    var attachment = new GlideSysAttachment();

    //set up inputs
     var fileName = 'atfTest.txt';
    var contentType = 'text/csv';
    var content = 'atfTest';

     items.forEach(function(item) {
        attachment.write(getCartItem(item.cart_item_id), fileName, contentType, content);
     });
    

};


var cart = new sn_sc.CartJS();
var item = {
    'sysparm_id': '3f1dd0320a0a0b99000a53f7604a2ef9',
    'sysparm_quantity': '1',
    'variables': {
        'comments': 'testing att',
        'urgency': 3
    }
};

var cartDetails = cart.addToCart(item);
addAttToCartItems(cartDetails.items);
cart.checkoutCart()