(Visual Basic 6.0) CardConnect Void

Demonstrates how to send a CardConnect void request.

The void service cancels a transaction that is in either "Authorized" or "Queued for Capture" status.. ...

See https://developer.cardconnect.com/cardconnect-api#void

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

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

Dim http As New ChilkatHttp
Dim success As Long

http.BasicAuth = 1
http.Login = "API_USERNAME"
http.Password = "API_PASSWORD"

' Build and send the following JSON:

' The "retref" is the value returned in the JSON response for the Authorization request.

' {
'     "retref":"112989260941",
'     "merchid":"MERCHANT_ID"
' }

Dim json As New ChilkatJsonObject
success = json.UpdateString("retref","112989260941")
success = json.UpdateString("merchid","MERCHANT_ID")

Dim url As String
url = "https://<site>.cardconnect.com:<port>/cardconnect/rest/void"
Dim responseStr As String
responseStr = http.PutText(url,json.Emit(),"utf-8","application/json",0,0)
If (http.LastMethodSuccess = 0) Then
    Debug.Print http.LastErrorText
    Exit Sub
End If

' A response status of 200 indicates potential success.  The JSON response body
' must be examined to determine if it was truly successful or an error.
Debug.Print "response status code = " & http.LastStatus

Dim jsonResp As New ChilkatJsonObject
success = jsonResp.Load(responseStr)
jsonResp.EmitCompact = 0

Debug.Print "response JSON:"
Debug.Print jsonResp.Emit()

' A successful response looks like this:

' {
'   "authcode": "REVERS",
'   "respproc": "FNOR",
'   "amount": "0.00",
'   "resptext": "Approval",
'   "currency": "USD",
'   "retref": "112989260941",
'   "respstat": "A",
'   "respcode": "00",
'   "merchid": "496160873888"
' }

' Use this online tool to generate parsing code from sample JSON: 
' Generate Parsing Code from JSON

Dim authcode As String
authcode = jsonResp.StringOf("authcode")
Dim respproc As String
respproc = jsonResp.StringOf("respproc")
Dim amount As String
amount = jsonResp.StringOf("amount")
Dim resptext As String
resptext = jsonResp.StringOf("resptext")
Dim currency As String
currency = jsonResp.StringOf("currency")
Dim retref As String
retref = jsonResp.StringOf("retref")
Dim respstat As String
respstat = jsonResp.StringOf("respstat")
Dim respcode As String
respcode = jsonResp.StringOf("respcode")
Dim merchid As String
merchid = jsonResp.StringOf("merchid")