SOLID [S] - Splitting class (Class with SRP)

solid-S-splitting-class.cs

public class PaymentService : IPaymentService
{
    private readonly IPaymentRepository PaymentRepository;

    private readonly INotificationService NotificationService;

    private readonly IBankService BankService;

    public PaymentService(
        IPaymentRepository paymentRepository, 
        INotificationService notificationService, 
        IBankService bankService)
    {
        this.PaymentRepository = paymentRepository;
        this.NotificationService = notificationService;
        this.BankService = bankService;
    }

    public Payment ProcessPayment(Payment payment)
    {
        var transaction = this.BankService.CreateTransaction(payment);

        payment.AddBankTransaction(transaction);

        var notificationMessage = payment.Map<NotificationMessage>();
        this.NotificationService.NotifyByEmail(notificationMessage)
        
        this.PaymentRepository.CreatePayment(payment);
        
        return payment;
    }
}

public class PaymentRepository : BaseRepository<Payment>, IPaymentRepository
{
    // contructor / dependencies 

    public void CreatePayment(Payment payment) 
    { 
        // code code code
    }
}

public class NotificationService : INotificationService
{
    // contructor / dependencies
    
    public void NotifyByEmail(NotificationMessage notificationMessage) 
    {
        // code code code
    }
}

public class NotificationMessage 
{ 
    // data transfer obejct 
}

public class BankService : IBankService
{
    // contructor / dependencies
    
    public Transaction CreateTransaction(Payment payment) 
    {
        // code code code
    }
}