public async Task<UserDto> RegisterNewUserAccount(CreateAccountDto userInfo)
    {
        EnsureUserDoesNotAlreadyExist(userInfo);
        EnsureRfidCardIsNotAlreadyClaimed(userInfo);

        var user = new UserDto()
        {
            Email = userInfo.EmailAddress.ToLower(),
            FirstAndLastName = userInfo.FirstAndLastName,
            Rank = 1200,
            JoinedTimestamp = DateTime.UtcNow.ToString()
        };

        await _usersRepository.CreateUser(user);

        var passwordHasher = new PasswordHasher<AccountCredentials>();
        var credentials = new AccountCredentials()
        {
            Email = userInfo.EmailAddress.ToLower(),
            HashedPassword = passwordHasher.HashPassword(null, userInfo.Password)
        };

        await _accountCredentialsRepository.InsertNewUserCredentials(credentials);
        await _emailSender.SendNewUserWelcomeEmail(userInfo);

        return await _usersRepository.GetUserWithEmail(user.Email);
    }

    private void EnsureUserDoesNotAlreadyExist(CreateAccountDto userInfo)
    {
        if (_usersRepository.GetUserWithEmail(userInfo.EmailAddress) != null)
        {
            throw new ResourceAlreadyExistsException("Email already in use.");
        }
    }

    private void EnsureRfidCardIsNotAlreadyClaimed(CreateAccountDto userInfo)
    {
        if (_usersRepository.GetUserWithRfid(userInfo.RfidNumber) != null)
        {
            throw new ResourceAlreadyExistsException("RFID card already in use.");
        }
    }