The VaxYes verification level is shown on both the digital wallet pass itself, and the verification screen that appears after the QR code is scanned. On the wallet pass, the verification level is displayed in the top right corner:
The QR code can be scanned by using the camera app on your smartphone or tablet. No special app is needed.
After the QR code is scanned and the patron confirms their birthdate (necessary for verification), the verification level is displayed above the photo of their CDC issued vaccine card: