(VB.NET UWP/WinRT) Global Payments Card Authorization

Demonstrates how to send a card payments authorization request.

For more information, see https://developer.globalpay.com/#!/api/card-payments#api-authorisation

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

' This example requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

Dim http As New Chilkat.Http
Dim success As Boolean

' if you don't have a Client ID yet you can still quickly test some basic request types using the following URL and credentials:

' Test URL - https://test.realexpayments.com/epage-remote.cgi
' Client ID: realexsandbox
' Shared Secret: Po8lRRT67a
Dim testUrl As String = "https://test.realexpayments.com/epage-remote.cgi"
Dim clientID As String = "realexsandbox"
Dim sharedSecret As String = "Po8lRRT67a"

Dim amount As String = "1001"
Dim currency As String = "EUR"
Dim cardNumber As String = "4263970000005262"

' We'll be sending the following XML in the body of the request:

' <?xml version="1.0" encoding="UTF-8"?>
' <request type="auth" timestamp="20180613141207">
'   <merchantid>MerchantId</merchantid>
'   <account>internet</account>
'   <channel>ECOM</channel>
'   <orderid>N6qsk4kYRZihmPrTXWYS6g</orderid>
'   <amount currency="EUR">1001</amount>
'   <card>
'     <number>4263970000005262</number>
'     <expdate>0425</expdate>
'     <chname>James Mason</chname>
'     <type>VISA</type>
'     <cvn>
'       <number>123</number>
'       <presind>1</presind>
'     </cvn>
'   </card>
'   <autosettle flag="1"/>
'   <sha1hash>87707637a34ba651b6185718c863abc64b673f20</sha1hash>
' </request>

' Use this online tool to generate code from sample XML: 
' Generate Code to Create XML

' Get the current date/time in this format:  20180613141207
Dim dt As New Chilkat.CkDateTime
dt.SetFromCurrentSystemTime()
Dim dtStr As String = dt.GetAsIso8601("YYYYMMDDhhmmss",True)

' Generate a unique order ID
Dim prng As New Chilkat.Prng
Dim orderId As String = prng.GenRandom(32,"base64url")

' Compute the sha1hash
Dim crypt As New Chilkat.Crypt2
crypt.HashAlgorithm = "sha1"
crypt.EncodingMode = "hexlower"

Dim sbA As New Chilkat.StringBuilder
sbA.Append("timestamp.merchantid.orderid.amount.currency.cardnumber")
Dim numReplaced As Integer = sbA.Replace("timestamp",dtStr)
numReplaced = sbA.Replace("merchantid",clientID)
numReplaced = sbA.Replace("orderid",orderId)
numReplaced = sbA.Replace("amount",amount)
numReplaced = sbA.Replace("currency",currency)
numReplaced = sbA.Replace("cardnumber",cardNumber)

Dim hashA As String = crypt.HashStringENC(sbA.GetAsString())

Dim sbB As New Chilkat.StringBuilder
sbB.Append(hashA)
sbB.Append(".")
sbB.Append(sharedSecret)

Dim hashB As String = crypt.HashStringENC(sbB.GetAsString())


Dim xml As New Chilkat.Xml
xml.Tag = "request"
xml.AddAttribute("type","auth")
xml.AddAttribute("timestamp",dtStr)
xml.UpdateChildContent("merchantid",clientID)
xml.UpdateChildContent("account","internet")
xml.UpdateChildContent("channel","ECOM")
xml.UpdateChildContent("orderid",orderId)
xml.UpdateAttrAt("amount",True,"currency",currency)
xml.UpdateChildContent("amount",amount)
xml.UpdateChildContent("card|number",cardNumber)
xml.UpdateChildContent("card|expdate","0425")
xml.UpdateChildContent("card|chname","James Mason")
xml.UpdateChildContent("card|type","VISA")
xml.UpdateChildContent("card|cvn|number","123")
xml.UpdateChildContent("card|cvn|presind","1")
xml.UpdateAttrAt("autosettle",True,"flag","1")
xml.UpdateChildContent("sha1hash",hashB)

Dim resp As Chilkat.HttpResponse = Await http.PostXmlAsync(testUrl,xml.GetXml(),"utf-8")
If (http.LastMethodSuccess = False) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


Debug.WriteLine("Response Status Code: " & resp.StatusCode)

Debug.WriteLine("Response Body:")
Debug.WriteLine(resp.BodyStr)

If (resp.StatusCode <> 200) Then
    Debug.WriteLine("Failed.")
    Exit Sub
End If


' A status code of 200 indicates we received an XML response, but it could be an error message.
' Here's an example of an error response:

' <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
' <response timestamp="20200418142356">
'     <orderid>N6qsk4kYRZihmPrTXWYS6g</orderid>
'     <result>508</result>
'     <message>Invalid timestamp: '{' Value exceeds allowable limit: '}'</message>
' </response>

' We need to check the "result" within the XML.
xml.LoadXml(resp.BodyStr)

Dim result As Integer = xml.GetChildIntValue("result")
Debug.WriteLine("result = " & result)

' A successful result looks like this:

' <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
' <response timestamp="20200418145519">
'     <merchantid>realexsandbox</merchantid>
'     <account>internet</account>
'     <orderid>Cw93I1nFWVZuaATh46qMUCBlCcfrOvLo65C2cq5X-AY</orderid>
'     <result>00</result>
'     <authcode>L3pHww</authcode>
'     <message>AUTH CODE: L3pHww</message>
'     <pasref>96838535689610806</pasref>
'     <cvnresult>M</cvnresult>
'     <timetaken>87</timetaken>
'     <authtimetaken>67</authtimetaken>
'     <batchid>6322506</batchid>
'     <sha1hash>2fd2f15f97f1775779fe9bda536dc8317a4b39f6</sha1hash>
' </response>

If (result = 0) Then
    Debug.WriteLine("authcode = " & xml.GetChildContent("authcode"))
    Debug.WriteLine("Success.")

Else
    Debug.WriteLine("Failed.")
End If