public async Task <OperationResult> AddAsync(PaymentMethod paymentMethod)
{
var validationResult = _validator.Validate(paymentMethod);
if (!validationResult.IsValid)
{
var errors = validationResult.Errors.Select(e => e.ErrorMessage).ToList();
return(new OperationResult(false, paymentMethod, errors));
}
await _paymentMethodsRepository.AddAsync(paymentMethod);
await _unitOfWork.CommitAsync();
return(new OperationResult(true, paymentMethod, null));
}