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);
}