As Client Only
The following is an example of the simplest form of making a program that actually makes a payment. It is a windows form with one button making a payment for 10 SEK and printing the receipt to a TextBox. The only methods used are Create, Start, OpenAsync and PaymentAsync.
Warning: The IP address to terminal needs to be changed
Heads up: The first attempt will fail, since OpenAsync is successful but the terminal starts communicating with its host. Click the button again to start the payment.
Simplest form of implementation - Happy Flow
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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using SwpTrmLib;
using SwpTrmLib.NexoTypes;
namespace WindowsFormsApp1
{
public partial class Form1 : Form, ISwpTrmCallbackInterface
{
ISwPTrmIf_1 PAX;
public Form1()
{
InitializeComponent();
}
private async void button1_Click(object sender, EventArgs e)
{
if (PAX == null)
{
LoginToTerminal();
}
var result = await PAX.PaymentAsync(10);
if (result.ResponseResult == NexoResponseResult.Success)
{
textBox1.AppendText("APPROVED TRANSACTION" + Environment.NewLine);
}
else
{
textBox1.AppendText("REJECTED TRANSACTION" + Environment.NewLine);
textBox1.AppendText(result.ResponseText + Environment.NewLine);
}
// The result contains the receipt information
textBox1.AppendText(result.ReceiptBlob + Environment.NewLine);
}
private void CreatePAXInstance()
{
PAX = PAXTrmImp_1.Create(new SwpIfConfig(), this);
PAX.Start(new SaleApplInfo()
{
ApplicationName = "Quick Demo-Client Only",
ProviderIdentification = "SwP",
SoftwareVersion = "0.1",
POIID = "A-TEST-POIID",
SaleCapabilities = SaleCapabilitiesEnum.PrinterReceipt.ToString() // Client only mode!
});
}
private async void LoginToTerminal()
{
if (PAX == null)
{
CreatePAXInstance();
}
PAX.TerminalAddress = "192.168.1.34:11000";
var res = await PAX.OpenAsync();
if (res.Result == ResponseResult.Success)
{
textBox1.AppendText("Terminal connected " + Environment.NewLine);
textBox1.AppendText("Terminal: " + res.SerialNumber + Environment.NewLine);
textBox1.AppendText("Terminal version: " + res.SoftwareVersion + Environment.NewLine);
}
else
{
textBox1.AppendText("Failed to connect terminal " + Environment.NewLine);
textBox1.AppendText(res.Text + Environment.NewLine);
}
}
public void ConfirmationHandler(string text, IConfirmationResult callback)
{
throw new NotImplementedException();
}
public void EventNotificationHandler(EventToNotifyEnumeration type, string text)
{
throw new NotImplementedException();
}
private async void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
await PAX.CloseAsync();
PAX.Stop();
}
}
}
As Client and Server
Based on Simplest Client only the following runs as a server too. The difference is:
- Removed SalesCapabilites in call to Start
- Subscribed to the
OnTerminalDisplay
event - Added code to the callback
EventNotificationHandler
Heads up: When running as a server the program needs elevated privileges. It may be avoided by entering the following command as administrator:
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netsh http add urlacl url=http://*:11000/EPASSaleToPOI/3.1/ user=Everyone
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where :11000 is the default port. If listening to another port the command must be changed.
Simplest Client And Server form of implementation - Happy Flow
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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using SwpTrmLib;
using SwpTrmLib.NexoTypes;
namespace WindowsFormsApp1
{
public partial class Form1 : Form, ISwpTrmCallbackInterface
{
ISwPTrmIf_1 PAX;
public Form1()
{
InitializeComponent();
}
private async void button1_Click(object sender, EventArgs e)
{
if (PAX == null)
{
LoginToTerminal();
}
var res = await PAX.PaymentAsync(10);
if (res.ResponseResult == NexoResponseResult.Success)
{
textBox1.AppendText("APPROVED TRANSACTION" + Environment.NewLine);
}
else
{
textBox1.AppendText("REJECTED TRANSACTION" + Environment.NewLine);
textBox1.AppendText(res.ResponseText + Environment.NewLine);
}
// The result contains the receipt information
textBox1.AppendText(res.ReceiptBlob + Environment.NewLine);
}
private void CreatePAXInstance()
{
PAX = PAXTrmImp_1.Create(new SwpIfConfig(), this);
PAX.Start(new SaleApplInfo()
{
ApplicationName = "Quick Demo",
ProviderIdentification = "SwP",
SoftwareVersion = "0.1",
POIID = "A-TEST-POIID",
//SaleCapabilities = SaleCapabilitiesEnum.PrinterReceipt.ToString()
});
PAX.OnTerminalDisplay += PAX_OnTerminalDisplay;
}
// A DisplayRequest from the terminal
private void PAX_OnTerminalDisplay(string message)
{
textBox1.AppendText(message + Environment.NewLine);
}
private async void LoginToTerminal()
{
if (PAX == null)
{
CreatePAXInstance();
}
PAX.TerminalAddress = "192.168.1.34:11000";
var res = await PAX.OpenAsync();
if (res.Result == ResponseResult.Success)
{
textBox1.AppendText("Terminal connected " + Environment.NewLine);
textBox1.AppendText("Terminal: " + res.SerialNumber + Environment.NewLine);
textBox1.AppendText("Terminal version: " + res.SoftwareVersion + Environment.NewLine);
}
else
{
textBox1.AppendText("Failed to connect terminal " + Environment.NewLine);
textBox1.AppendText(res.Text + Environment.NewLine);
}
}
public void ConfirmationHandler(string text, IConfirmationResult callback)
{
throw new NotImplementedException();
}
public void EventNotificationHandler(EventToNotifyEnumeration type, string text)
{
textBox1.AppendText($"Event: {type} - {text}" + Environment.NewLine);
}
private async void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
if (PAX != null)
{
await PAX.CloseAsync();
PAX.Stop();
}
}
}
}
Changes From Client Only
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PAX.Start(new SaleApplInfo()
{
ApplicationName = "Quick Demo",
ProviderIdentification = "SwP",
SoftwareVersion = "0.1",
POIID = "A-POIID",
//SaleCapabilities = SaleCapabilitiesEnum.PrinterReceipt.ToString()
});
PAX.OnTerminalDisplay += PAX_OnTerminalDisplay;
and
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public void EventNotificationHandler(EventToNotifyEnumeration type, string text)
{
textBox1.AppendText($"Event: {type} - {text}" + Environment.NewLine);
}
Get CNA For Customer
Based on either Simplest Client or Client And Server, let’s take it a bit further and find out who the customer is before starting the actual purchase transaction. The only change is in the button1_click where GetPaymentInstrumentAsync
is called. The result contains among others masked PAN
and CNA - CardNumberAlias
.
This is a very simple way to handle members. The CNA will be the same in all our PAX terminals.
Get to know the customer before deciding amount - Happy Flow
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private async void button1_Click(object sender, EventArgs e)
{
if (PAX == null)
{
LoginToTerminal();
}
var cardres = await PAX.GetPaymentInstrumentAsync();
if (cardres.Result == NexoResponseResult.Success)
{
textBox1.AppendText($"CNA: {cardres.CNA}" + Environment.NewLine);
textBox1.AppendText($"for card: {cardres.PAN}" + Environment.NewLine);
var res = await PAX.PaymentAsync(10);
if (res.ResponseResult == NexoResponseResult.Success)
{
textBox1.AppendText("APPROVED TRANSACTION" + Environment.NewLine);
}
else
{
textBox1.AppendText("REJECTED TRANSACTION" + Environment.NewLine);
textBox1.AppendText(res.ResponseText + Environment.NewLine);
}
// The result contains the receipt information
textBox1.AppendText(res.ReceiptBlob + Environment.NewLine);
}
}
Handle Loyalty - Ask For Membership
Based on the version Get CNA For Customer, let’s see if CNA exists in the database and if so, give the customer a better price. If the costumer is not a member, ask them to join so they can get a better price next time.
The only change is to create a list of members and add CNA to that list if the customer wants to join.
Other that creating the Members which is a list of strings, there are only changes in the button1_click.
The important addition is the call to RequestCustomerConfirmationAsync
. It requests the terminal to show a message and asks for a yes/no response. The member CustomerConfirmation
of the result is true or false.
Note!: The delay before a new request after a finished transaction is needed. If the delay is not added, the request will get a failure due to terminal being busy
Remember: to add List<string> Member;
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private async void button1_Click(object sender, EventArgs e)
{
decimal priceofproduct = 10;
bool asktojoin = false;
if (PAX == null)
{
LoginToTerminal();
if (Members == null) {
Members = new List<string>();
}
}
var cardres = await PAX.GetPaymentInstrumentAsync();
if (cardres.Result == NexoResponseResult.Success)
{
textBox1.AppendText($"CNA: {cardres.CNA}" + Environment.NewLine);
textBox1.AppendText($"for card: {cardres.PAN}" + Environment.NewLine);
if (Members.Contains(cardres.CNA))
{
priceofproduct = 8;
}
else
{
asktojoin = true;
}
var res = await PAX.PaymentAsync(priceofproduct);
if (res.ResponseResult == NexoResponseResult.Success)
{
textBox1.AppendText("APPROVED TRANSACTION" + Environment.NewLine);
}
else
{
textBox1.AppendText("REJECTED TRANSACTION" + Environment.NewLine);
textBox1.AppendText(res.ResponseText + Environment.NewLine);
}
// The result contains the receipt information
textBox1.AppendText(res.ReceiptBlob + Environment.NewLine);
if (asktojoin)
{
await Task.Delay(3000);
var confirmres = await PAX.RequestCustomerConfirmationAsync("Would you like to join?");
if (confirmres.ResponseResult == NexoResponseResult.Success && confirmres.Confirmation == true)
{
Members.Add(cardres.CNA);
}
}
}
}