Add project files.

Fizetesek.slnx

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+<Solution>
+  <Project Path="Fizetesek/Fizetesek.csproj" />
+</Solution>

Fizetesek/App.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.7.2" />
+    </startup>
+</configuration>

Fizetesek/BankiUtalas.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Fizetesek
+{
+    internal class BankiUtalas : FizetesMod
+    {
+        
+
+
+        public override string Fizetes(int Osszeg)
+        {
+  
+                return ($"{Osszeg} összeg fizetve Banki utalásból");
+
+
+        }
+    }
+}

Fizetesek/FizetesMod.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Fizetesek
+{
+    internal abstract class FizetesMod
+    {
+        public abstract string Fizetes(int Osszeg);
+    }
+}

Fizetesek/Fizetesek.csproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{EF6820CD-68E8-4F4D-9BEC-FD5590D727F2}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <RootNamespace>Fizetesek</RootNamespace>
+    <AssemblyName>Fizetesek</AssemblyName>
+    <TargetFrameworkVersion>v4.7.2</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
+    <Deterministic>true</Deterministic>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="BankiUtalas.cs" />
+    <Compile Include="FizetesMod.cs" />
+    <Compile Include="IAzonosit.cs" />
+    <Compile Include="Kártyásfizetés.cs" />
+    <Compile Include="PayPalFizetes.cs" />
+    <Compile Include="Program.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="App.config" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>

Fizetesek/IAzonosit.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Fizetesek
+{
+    internal interface IAzonosit
+    {
+        bool Azonosit();
+    }
+}

Fizetesek/Kártyásfizetés.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Fizetesek
+{
+    internal class Kártyásfizetés : FizetesMod, IAzonosit
+    {
+        public bool Azonosit()
+        {
+            Console.WriteLine("jelszót kérek a kártyás fizetéshez");
+            string beutottjelszo = Console.ReadLine();
+
+            if (beutottjelszo == "kartya")
+            {
+                return true;
+
+            }
+            else
+            {
+                return false;
+            }
+        }
+
+
+        public override string Fizetes(int Osszeg)
+        {
+
+
+
+
+
+
+
+            if (Azonosit())
+            {
+                return ($"{Osszeg} összeg fizetve Banki utalásból");
+            }
+            else
+            {
+                return ("nem sikerült a bejelentkezés a Kártyába");
+            }
+        }
+    }
+}

Fizetesek/PayPalFizetes.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Security.Cryptography.X509Certificates;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Fizetesek
+{
+    internal class PayPalFizetes : FizetesMod, IAzonosit
+    {
+        public bool Azonosit()
+        {
+            Console.WriteLine("jelszót kérek a paypalba");
+            string beutottjelszo = Console.ReadLine();
+
+            if (beutottjelszo == "jelszo")
+            {
+                return true;
+
+            }
+            else
+            {
+                return false;
+            }
+        }
+
+
+        public override string Fizetes(int Osszeg)
+        {
+
+            
+
+
+
+
+
+            if (Azonosit()) {
+                return ($"{Osszeg} összeg fizetve PayPalról");
+            }
+            else
+            {
+                return ("nem sikerült a bejelentkezés a Paypalba");
+            }
+        }
+    }
+}

Fizetesek/Program.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Fizetesek
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            Kártyásfizetés kartya = new Kártyásfizetés();
+            BankiUtalas otp = new BankiUtalas();
+            PayPalFizetes payPalF = new PayPalFizetes();
+
+            Console.WriteLine(kartya.Fizetes(120));
+            Console.WriteLine(payPalF.Fizetes(120));
+            Console.WriteLine(otp.Fizetes(60));
+            
+            
+        }
+    }
+}

Fizetesek/Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("Fizetesek")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("Fizetesek")]
+[assembly: AssemblyCopyright("Copyright ©  2026")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components.  If you need to access a type in this assembly from
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("ef6820cd-68e8-4f4d-9bec-fd5590d727f2")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version
+//      Build Number
+//      Revision
+//
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]