Fetch and Parse XML data from Live product feed

Question

I am simply trying to extract the data from this XML link I have but I have no clue how to run a query like that neither the second source is responding correctly to fetch and parse the feed

Full inventory query: http://idexonline.com/Idex_Feed_API-Full_Inventory?String_Access=7HF7MZ3M0SZ061N39P9T0IN01

Inventory Update query: http://idexonline.com/Idex_Feed_API-Inventory_Update?String_Access=7HF7MZ3M0SZ061N39P9T0IN01

Appreantly I am supposed to run the first link once and then the second update to recieve all product information. So far I have:

document.addEventListener('DOMContentLoaded', ()=>{
            //fetch the data as soon as the page has loaded
            let url = "http://idexonline.com/Idex_Feed_API-Full_Inventory?String_Access=7HF7MZ3M0SZ061N39P9T0IN01";
            fetch(url)
            .then(response=>response.text())
            .then(data=>{
                //console.log(data);  //string
                let parser = new DOMParser();
                let xml = parser.parseFromString(data, "application/xml");
                document.getElementById('output').textContent = data;
                console.log(xml);
                buildHouseList(xml);
                buildSwordList(xml);
            });
        })