adding PaymentGateway classes

Author: Edrisym

DesignPattern.Builder.PaymentService/IPaymentGateway.cs

@@ -0,0 +1,13 @@
+namespace DesignPattern.Builder.PaymentService;
+
+public interface IPaymentGateway
+{
+    IPaymentGateway GatewayName(string gatewayName);
+    IPaymentGateway Currency(string currency);
+    IPaymentGateway Amount(decimal amount);
+    IPaymentGateway PaymentMethod(string paymentMethod);
+    IPaymentGateway WebhookUrl(string url);
+    IPaymentGateway TransactionFee(decimal fee);
+
+    PaymentGateway CreateGateway();
+}

DesignPattern.Builder.PaymentService/PaymentGateway.cs

@@ -0,0 +1,44 @@
+using System.Text;
+
+namespace DesignPattern.Builder.PaymentService;
+
+public class PaymentGateway
+{
+    public string Name { get; set; }
+    public string Currency { get; set; }
+    public decimal Amount { get; set; }
+    public string SupportedPaymentMethod { get; set; }
+    public string WebhookUrl { get; set; }
+    public decimal TransactionFee { get; set; }
+
+    public override string ToString()
+    {
+        var text = $"Payment Gateway: {Name}\n" +
+                   $"Currency: {Currency}\n" +
+                   $"Amount: {Amount:C2} {Currency}\n" +
+                   $"Transaction Fee: {TransactionFee:P2}\n" +
+                   $"Supported Payment Methods: {SupportedPaymentMethod}\n" +
+                   $"Webhook URL: {WebhookUrl}\n" +
+                   $"Total Charge (Amount + Fee): {(Amount + (Amount * TransactionFee)):C2} {Currency}\n" +
+                   $"Processing Status: {ProcessPaymentResult()}";
+        return text;
+    }
+
+    private string ProcessPaymentResult()
+    {
+        if (Amount > 0 && !string.IsNullOrEmpty(SupportedPaymentMethod))
+        {
+            return "Payment processed successfully.";
+        }
+
+        return "Payment failed. Invalid amount or payment method.";
+    }
+}
+
+public enum EnumPaymentMethods
+{
+    CreditCard = 1,
+    DebitCard = 2,
+    ApplePay = 3,
+    GooglePay = 4
+}