(PHP Extension) Refresh Schwab OAuth2 Access Token

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<?php

include("chilkat.php");

$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.

$jsonToken = new CkJsonObject();
$success = $jsonToken->LoadFile('qa_data/tokens/schwab-access-token.json');
if ($success != true) {
    print 'Failed to load schwab-access-token.json' . "\n";
    exit;
}

// 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"
// }

$oauth2 = new CkOAuth2();

$oauth2->put_TokenEndpoint('https://api.schwabapi.com/v1/oauth/token');

// Replace these with actual values.
$oauth2->put_ClientId('APP_KEY');
$oauth2->put_ClientSecret('APP_SECRET');
$oauth2->put_UseBasicAuth(true);

// Get the "refresh_token"
$oauth2->put_RefreshToken($jsonToken->stringOf('refresh_token'));

// Send the HTTP POST to refresh the access token..
$success = $oauth2->RefreshAccessToken();
if ($success == false) {
    print $oauth2->lastErrorText() . "\n";
    exit;
}

// 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.
$sbJson = new CkStringBuilder();
$jsonToken->put_EmitCompact(false);

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

print 'OAuth2 token refreshed!' . "\n";
print 'New Access Token = ' . $oauth2->accessToken() . "\n";

?>