(.NET Core C#) Get Google API Access Token using P12 Service Account Key

Demonstrates how to get a Google API access token using a P12 service account key.

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

// First load the PKCS12 (.p12 / .pfx) into a PFX object.
Chilkat.Pfx pfx = new Chilkat.Pfx();
bool success = pfx.LoadPfxFile("qa_data/googleSvcAccountKeys/ChilkatCloud-6ba1b17d6d16.p12","notasecret");
if (success != true) {
    Debug.WriteLine(pfx.LastErrorText);
    return;
}

Chilkat.AuthGoogle gAuth = new Chilkat.AuthGoogle();
success = gAuth.SetP12(pfx);

// Set the client email address.
gAuth.EmailAddress = "pip-563@chilkatcloud.iam.gserviceaccount.com";

// Choose a scope.
gAuth.Scope = "https://www.googleapis.com/auth/cloud-platform";

// Request an access token that is valid for this many seconds.
gAuth.ExpireNumSeconds = 3600;

// If the application is requesting delegated access:
// The email address of the user for which the application is requesting delegated access,
// then set the email address here. (Otherwise leave it empty.)
gAuth.SubEmailAddress = "";

// Connect to www.googleapis.com using TLS (TLS 1.2 is the default.)
// The Chilkat socket object is used so that the connection can be established
// through proxies or an SSH tunnel if desired.
Chilkat.Socket tlsSock = new Chilkat.Socket();
success = tlsSock.Connect("www.googleapis.com",443,true,5000);
if (success != true) {
    Debug.WriteLine(tlsSock.LastErrorText);
    return;
}

// Send the request to obtain the access token.
success = gAuth.ObtainAccessToken(tlsSock);
if (success != true) {
    Debug.WriteLine(gAuth.LastErrorText);
    return;
}

// Examine the access token:
Debug.WriteLine("Access Token: " + gAuth.AccessToken);