(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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#include <CkCert.h>
#include <CkBinData.h>
#include <CkPrivateKey.h>
#include <CkHttp.h>
#include <CkHttpRequest.h>
#include <CkHttpResponse.h>
#include <CkJsonObject.h>

void ChilkatSample(void)
    {
    // 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'

    CkCert cert;
    bool success = cert.LoadFromFile("qa_data/certs/TPPCertificate.cer");
    if (success != true) {
        std::cout << cert.lastErrorText() << "\r\n";
        return;
    }

    CkBinData bdKey;
    success = bdKey.LoadFile("qa_data/certs/TPPprivateKey.key");

    CkPrivateKey privKey;
    success = privKey.LoadAnyFormat(bdKey,"passwordIfNeeded");
    if (success != true) {
        std::cout << privKey.lastErrorText() << "\r\n";
        return;
    }

    success = cert.SetPrivateKey(privKey);
    if (success != true) {
        std::cout << cert.lastErrorText() << "\r\n";
        return;
    }

    CkHttp http;

    success = http.SetSslClientCert(cert);
    if (success != true) {
        std::cout << http.lastErrorText() << "\r\n";
        return;
    }

    CkHttpRequest req;
    req.AddParam("grant_type","client_credentials");
    req.AddParam("client_id","TPP_test");
    req.AddParam("scope","psd2:payment:sepa:write psd2:payment:sepa:read");

    CkHttpResponse *resp = http.PostUrlEncoded("https://auth-sandbox.connect.abnamro.com:8443/as/token.oauth2",req);
    if (http.get_LastMethodSuccess() == false) {
        std::cout << http.lastErrorText() << "\r\n";
        return;
    }

    if (resp->get_StatusCode() != 200) {
        std::cout << resp->bodyStr() << "\r\n";
        delete resp;
        return;
    }

    // Get the JSON result:
    // {"access_token":"TIhycwl8rfrZPkXGw15mwldASAAK","token_type":"Bearer","expires_in":7200}
    CkJsonObject json;
    json.Load(resp->bodyStr());
    std::cout << "access_token: " << json.stringOf("access_token") << "\r\n";
    std::cout << "token_type: " << json.stringOf("token_type") << "\r\n";
    std::cout << "expires_in: " << json.stringOf("expires_in") << "\r\n";

    delete resp;
    }