Add project files.

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>

Program.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Zradelna
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            //Create new instance of client
+            WebApiClient wa = new WebApiClient();
+
+            //Open homepage first to get sessin ID and cookie
+            wa.OpenHomepage();
+
+            //Login as "FFFFFFFF"
+            wa.Login(CardToId("FFFFFFFF"));
+
+            //Get current account balance
+            wa.GetAccountBalance();
+        }
+
+        /// <summary>
+        /// HEX (Little-endian) string to UInt32 as string 
+        /// </summary>
+        /// <param name="hexString"></param>
+        /// <returns></returns>
+        static string CardToId(string hexString)
+        {
+            StringBuilder sb = new StringBuilder();
+
+            uint num = uint.Parse(hexString, System.Globalization.NumberStyles.AllowHexSpecifier);
+
+            byte[] floatVals = BitConverter.GetBytes(num);
+            byte[] newArray = new byte[4];
+            int position = 3;
+
+            foreach (byte b in floatVals)
+            {
+                newArray[position] = b;
+                position--;
+            }
+
+            return BitConverter.ToUInt32(newArray, 0).ToString();
+        }
+    }
+
+
+}

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("Zradelna")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("HP Inc.")]
+[assembly: AssemblyProduct("Zradelna")]
+[assembly: AssemblyCopyright("Copyright © HP Inc. 2021")]
+[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("9d0dfb31-ab4a-4a14-8b90-260300cdf667")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

WebApiClient.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Net;
+using System.IO;
+using System.Data;
+using System.Web;
+using Newtonsoft.Json;
+using System.Text.RegularExpressions;
+
+namespace Zradelna
+{
+    public class WebApiClient
+    {
+        string cookie = string.Empty;
+
+        private string login_id;
+        private string boarder;
+        private string workstation;
+        private string acc_id;
+
+        private double accountBalance;
+
+        public string Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9";
+        public string UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36 OPR/81.0.4196.60";
+
+        public string Login_id { get => login_id; set => login_id = value; }
+        public string Boarder { get => boarder; set => boarder = value; }
+        public string Workstation { get => workstation; set => workstation = value; }
+        public string Acc_id { get => acc_id; set => acc_id = value; }
+        public double AccountBalance { get => accountBalance; }
+
+        /// <summary>
+        /// Open homepage to set session ID and get in the cookie
+        /// </summary>
+        public void OpenHomepage()
+        {
+            var request = (HttpWebRequest)WebRequest.Create("http://172.15.27.236:8080/isis/objednavkytouch/index");
+
+            request.Accept = Accept;
+            request.Method = "GET";
+            request.ContentType = "text/html; charset=utf-8";
+            request.UserAgent = UserAgent;
+
+            var response = (HttpWebResponse)request.GetResponse();
+            var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
+
+            cookie = response.Headers[HttpResponseHeader.SetCookie]; //Get cookie
+        }
+
+        /// <summary>
+        /// Call login function using cookie
+        /// </summary>
+        /// <param name="cardreader">Card ID - personal indetifier</param>
+        /// <returns></returns>
+        public void Login(string cardreader)
+        {
+            var request = (HttpWebRequest)WebRequest.Create("http://172.15.27.236:8080/isis/objednavkytouch/loginon");
+
+            var postData = "{\"cardreader\": \"" + cardreader + "\"}";
+            var data = Encoding.ASCII.GetBytes(postData);
+
+            request.Accept = Accept;
+            request.Method = "POST";
+            request.ContentLength = data.Length;
+            request.ContentType = "application/json";
+            request.UserAgent = UserAgent;
+            request.Referer = "http://172.15.27.236:8080/isis/objednavkytouch/index";
+
+            request.Headers[HttpRequestHeader.Cookie] = cookie; //Set cookie
+
+            using (var stream = request.GetRequestStream())
+                stream.Write(data, 0, data.Length);
+
+            var response = (HttpWebResponse)request.GetResponse();
+            var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
+
+            GetLoginInfo( responseString);
+        }
+
+        /// <summary>
+        /// Get login info from response string while logged in
+        /// </summary>
+        /// <param name="response"></param>
+        public void GetLoginInfo(string response)
+        {
+            //Get login info
+            string json = new Regex("a_data=(.*)").Match(response).Groups[1].Value; //Extract desired JSON data
+            DataTable dtLoginInfo = (DataTable)Newtonsoft.Json.JsonConvert.DeserializeObject("[" + json + "]", (typeof(DataTable))); //Convert to DataTable
+
+            login_id = dtLoginInfo.Rows[0]["login_id"].ToString();
+            boarder = dtLoginInfo.Rows[0]["boarder"].ToString();
+            workstation = dtLoginInfo.Rows[0]["workstation"].ToString();
+            acc_id = dtLoginInfo.Rows[0]["acc_id"].ToString();
+        }
+
+        /// <summary>
+        /// Get current account balance for active login
+        /// </summary>
+        public void GetAccountBalance()
+        {
+            var request = (HttpWebRequest)WebRequest.Create("http://172.15.27.236:8080/isis/objednavky/AccountList");
+
+            var postData = "{\"login_id\": \""  + login_id + "\",";
+            postData += "\"boarder\": \""       + boarder + "\",";
+            postData += "\"accounts\": \""      + "" + "\",";
+            postData += "\"workstation\": \""   + workstation + "\",";
+            postData += "\"acc_id\": \""        + acc_id + "\",";
+            postData += "\"dest_id\": \""       + acc_id + "\"}";
+            var data = Encoding.ASCII.GetBytes(postData);
+
+            request.Accept = Accept;
+            request.Method = "POST";
+            request.ContentLength = data.Length;
+            request.ContentType = "application/json";
+            request.UserAgent = UserAgent;
+            request.Referer = "http://172.15.27.236:8080/isis/objednavkytouch/index";
+
+            request.Headers[HttpRequestHeader.Cookie] = cookie; //Set cookie
+
+            using (var stream = request.GetRequestStream())
+                stream.Write(data, 0, data.Length);
+
+            var response = (HttpWebResponse)request.GetResponse();
+            var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
+
+            string stringBalance = new Regex("<b>(.*) Kč</b>").Match(responseString).Groups[1].Value; //Extract desired data
+
+            Double.TryParse(stringBalance, out accountBalance);
+        }
+
+
+    }
+}

Zradelna.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>{9D0DFB31-AB4A-4A14-8B90-260300CDF667}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <RootNamespace>Zradelna</RootNamespace>
+    <AssemblyName>Zradelna</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="HtmlAgilityPack, Version=1.11.39.0, Culture=neutral, PublicKeyToken=bd319b19eaf3b43a, processorArchitecture=MSIL">
+      <HintPath>packages\HtmlAgilityPack.1.11.39\lib\Net45\HtmlAgilityPack.dll</HintPath>
+    </Reference>
+    <Reference Include="Newtonsoft.Json, Version=13.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
+      <HintPath>packages\Newtonsoft.Json.13.0.1\lib\net45\Newtonsoft.Json.dll</HintPath>
+    </Reference>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Web" />
+    <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="Program.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="WebApiClient.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="App.config" />
+    <None Include="packages.config" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>

Zradelna.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.29728.190
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Zradelna", "Zradelna.csproj", "{9D0DFB31-AB4A-4A14-8B90-260300CDF667}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{9D0DFB31-AB4A-4A14-8B90-260300CDF667}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{9D0DFB31-AB4A-4A14-8B90-260300CDF667}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{9D0DFB31-AB4A-4A14-8B90-260300CDF667}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{9D0DFB31-AB4A-4A14-8B90-260300CDF667}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {32E404A9-25D5-43C3-8020-D181EA891837}
+	EndGlobalSection
+EndGlobal

packages.config

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+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="HtmlAgilityPack" version="1.11.39" targetFramework="net472" />
+  <package id="Newtonsoft.Json" version="13.0.1" targetFramework="net472" />
+</packages>