(.NET Core C#) Refresh Schwab OAuth2 Access Token

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bool success = false;

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

// See Get Schwab OAuth2 Access Token 
// for sample code showing how to obtain a Schwab access token for desktop apps.

// This example assumes we previously obtained an OAuth2 access token for Schwab.

Chilkat.JsonObject jsonToken = new Chilkat.JsonObject();
success = jsonToken.LoadFile("qa_data/tokens/schwab-access-token.json");
if (success != true) {
    Debug.WriteLine("Failed to load schwab-access-token.json");
    return;
}

// The access token JSON looks something like this:

// {
//   "expires_in": 3600,
//   "x_refresh_token_expires_in": 8726400,
//   "refresh_token": "L011546037639r ... 3vR2DrbOmg0Sdagw",
//   "access_token": "eyJlbmMiOiJBMTI4Q0 ... oETJEMbeggg",
//   "token_type": "bearer"
// }

Chilkat.OAuth2 oauth2 = new Chilkat.OAuth2();

oauth2.TokenEndpoint = "https://api.schwabapi.com/v1/oauth/token";

// Replace these with actual values.
oauth2.ClientId = "APP_KEY";
oauth2.ClientSecret = "APP_SECRET";
oauth2.UseBasicAuth = true;

// Get the "refresh_token"
oauth2.RefreshToken = jsonToken.StringOf("refresh_token");

// Send the HTTP POST to refresh the access token..
success = oauth2.RefreshAccessToken();
if (success == false) {
    Debug.WriteLine(oauth2.LastErrorText);
    return;
}

// The response contains a new access token, but we must keep
// our existing refresh token for when we need to refresh again in the future.
jsonToken.UpdateString("access_token",oauth2.AccessToken);

// Save the new JSON access token response to a file.
// The access + refresh tokens contained in this JSON will be needed for the next refresh.
Chilkat.StringBuilder sbJson = new Chilkat.StringBuilder();
jsonToken.EmitCompact = false;

jsonToken.EmitSb(sbJson);
sbJson.WriteFile("qa_data/tokens/schwab-access-token.json","utf-8",false);

Debug.WriteLine("OAuth2 token refreshed!");
Debug.WriteLine("New Access Token = " + oauth2.AccessToken);