All you have to do to add a QR code to your URL is change the end of the bit.ly link to .qr and it generates a QR code automatically. The image on the left is one I generated in a matter of seconds ...

TECH How to scan a QR code with your iPhone or Android phone (no apps needed) QR codes are those pixelated squares you see in restaurants, advertisements, stores, food packaging, business cards ...

Currently, link creation is only available for WhatsApp Business users. Regular WhatsApp users can use the WhatsApp Click to Chat or generate a link from the QR code on WhatsApp.