code: func GenerateQRCode(u string) ([]byte, error) {
  	otpKey, err := otp.NewKeyFromURL(u)
  	if err != nil {
  		return nil, trace.Wrap(err)
  	}
  
  	otpImage, err := otpKey.Image(450, 450)
  	if err != nil {
  		return nil, trace.Wrap(err)
  	}
  
  	var otpQR bytes.Buffer
  	err = png.Encode(&otpQR, otpImage)
  	if err != nil {
  		return nil, trace.Wrap(err)
  	}
  
  	return otpQR.Bytes(), nil
  }
docs: // GenerateQRCode takes in a OTP Key URL and returns a PNG-encoded QR code.