code: func (token *Token) URL() string {
  
  	return fmt.Sprintf(
  		"otpauth://totp/%s:%s?secret=%s&issuer=%s",
  		token.Provider,
  		token.User,
  		token.Secret,
  		token.Provider,
  	)
  }
docs: //URL creates a the Key Uri Format url (otpauth://... )to enable users to pick this up in the totp applications