Javascript expert required

I need an expert in javascript to help me with a piece of code. Basically i need to generate a uuidv4 and pass it to the tx_ref parameter in makePayment function please see both functions below it needs to be done dynamically everytime the page loads. function uuidv4() { return ([1e7]+-1e3+-4e3+-8e3+-1e11).replace(/[018]/g, c => (c ^ [login to view URL](new Uint8Array(1))[0] & 15 >> c / 4).toString(16) ); } [login to view URL](uuidv4()); <script src="[login to view URL]"></script> <form> <div> Your order is ₦54,600 </div> <button type="button" id="start-payment-button" onclick="makePayment()">Pay Now</button> </form> <script> function makePayment() { FlutterwaveCheckout({ public_key: "FLWPUBK_TEST-SANDBOXDEMOKEY-X", tx_ref: "titanic-48981487343MDI0NzMx", amount: 54600, currency: "NGN", payment_options: "card, banktransfer, ussd", redirect_url: "[login to view URL]", meta: { consumer_id: 23, consumer_mac: "92a3-912ba-1192a", }, customer: { email: "[login to view URL]", phone_number: "08102909304", name: "Rose DeWitt Bukater", }, customizations: { title: "The Titanic Store", description: "Payment for an awesome cruise", logo: "[login to view URL]", }, }); } </script>