public async Task Handle(PlaceLoanApplication command)
        {
            var id = await _loanApplicationRepository.GetNextId();

            var loanApplication = new LoanApplication(id, command.ApplicantId, command.Amount);
            var interestRate    = await _interestRateCalculator.GetInterestRateFor(command.ApplicantId);

            loanApplication.SetInterestRate(interestRate);
            await _loanApplicationRepository.Add(loanApplication);
        }