(.NET Core C#) 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

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// 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'

Chilkat.Cert cert = new Chilkat.Cert();
bool success = cert.LoadFromFile("qa_data/certs/TPPCertificate.cer");
if (success != true) {
    Debug.WriteLine(cert.LastErrorText);
    return;
}

Chilkat.BinData bdKey = new Chilkat.BinData();
success = bdKey.LoadFile("qa_data/certs/TPPprivateKey.key");

Chilkat.PrivateKey privKey = new Chilkat.PrivateKey();
success = privKey.LoadAnyFormat(bdKey,"passwordIfNeeded");
if (success != true) {
    Debug.WriteLine(privKey.LastErrorText);
    return;
}

success = cert.SetPrivateKey(privKey);
if (success != true) {
    Debug.WriteLine(cert.LastErrorText);
    return;
}

Chilkat.Http http = new Chilkat.Http();

success = http.SetSslClientCert(cert);
if (success != true) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

Chilkat.HttpRequest req = 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");

Chilkat.HttpResponse resp = http.PostUrlEncoded("https://auth-sandbox.connect.abnamro.com:8443/as/token.oauth2",req);
if (http.LastMethodSuccess == false) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

if (resp.StatusCode != 200) {
    Debug.WriteLine(resp.BodyStr);

    return;
}

// Get the JSON result:
// {"access_token":"TIhycwl8rfrZPkXGw15mwldASAAK","token_type":"Bearer","expires_in":7200}
Chilkat.JsonObject json = 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"));