Refresh QuickBooks OAuth2 Access Token

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var success = false;

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

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

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

var jsonToken = new CkJsonObject();
success = jsonToken.LoadFile("qa_data/tokens/qb-access-token.json");
if (success !== true) {
    console.log("Failed to load qb-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"
// }

var oauth2 = new CkOAuth2();

oauth2.TokenEndpoint = "https://oauth.platform.intuit.com/oauth2/v1/tokens/bearer";

// Replace these with actual values.
oauth2.ClientId = "QUICKBOOKS-CLIENT-ID";
oauth2.ClientSecret = "QUICKBOOKS-CLIENT-SECRET";

// 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) {
    console.log(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.
var sbJson = new CkStringBuilder();
jsonToken.EmitCompact = false;

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

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