(VB.NET) ABN AMRO OAuth2 Client Credentials Authentication

Demonstrates how to obtain an access token for an ABN AMRO online API using OAuth2 with the Client Credentials flow.

For more information, see https://developer.abnamro.com/api/payment-initiation-v1/payment-initiation-tutorial

Chilkat .NET Downloads Chilkat .NET Framework Chilkat for .NET Core

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

' This example sends the following CURL request:

' 	curl -X POST -k https://auth-sandbox.connect.abnamro.com:8443/as/token.oauth2 \
' 	-v \
' 	--cert TPPCertificate.crt \
' 	--key TPPprivateKey.key \
' 	-H 'Cache-Control: no-cache' \
' 	-H 'Content-Type: application/x-www-form-urlencoded' \
' 	-d 'grant_type=client_credentials&client_id=TPP_test&scope=psd2:payment:sepa:write psd2:payment:sepa:read'

Dim cert As New Chilkat.Cert
Dim success As Boolean = cert.LoadFromFile("qa_data/certs/TPPCertificate.cer")
If (success <> True) Then
    Debug.WriteLine(cert.LastErrorText)
    Exit Sub
End If


Dim bdKey As New Chilkat.BinData
success = bdKey.LoadFile("qa_data/certs/TPPprivateKey.key")

Dim privKey As New Chilkat.PrivateKey
success = privKey.LoadAnyFormat(bdKey,"passwordIfNeeded")
If (success <> True) Then
    Debug.WriteLine(privKey.LastErrorText)
    Exit Sub
End If


success = cert.SetPrivateKey(privKey)
If (success <> True) Then
    Debug.WriteLine(cert.LastErrorText)
    Exit Sub
End If


Dim http As New Chilkat.Http

success = http.SetSslClientCert(cert)
If (success <> True) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


Dim req As New Chilkat.HttpRequest
req.AddParam("grant_type","client_credentials")
req.AddParam("client_id","TPP_test")
req.AddParam("scope","psd2:payment:sepa:write psd2:payment:sepa:read")

Dim resp As Chilkat.HttpResponse = http.PostUrlEncoded("https://auth-sandbox.connect.abnamro.com:8443/as/token.oauth2",req)
If (http.LastMethodSuccess = False) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


If (resp.StatusCode <> 200) Then
    Debug.WriteLine(resp.BodyStr)

    Exit Sub
End If


' Get the JSON result:
' {"access_token":"TIhycwl8rfrZPkXGw15mwldASAAK","token_type":"Bearer","expires_in":7200}
Dim json As New Chilkat.JsonObject
json.Load(resp.BodyStr)
Debug.WriteLine("access_token: " & json.StringOf("access_token"))
Debug.WriteLine("token_type: " & json.StringOf("token_type"))
Debug.WriteLine("expires_in: " & json.StringOf("expires_in"))