(PHP Extension) Refresh eBay Application Access Token

This example shows how to get a new eBay REST API access token when the original is close to expiration.

Note: This example requires Chilkat v9.5.0.80 or greater. (This example was written on 21-August-2019, before v9.5.0.80 was released. If Contact Chilkat for a pre-release if the current Chilkat version is not yet at 9.5.0.80 or greater.)

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<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

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

// The previously fetched eBay access token looks like this:

// {
//   "access_token": "v^1.1#i^1# ... HwSAAA=",
//   "expires_in": 7200,
//   "refresh_token": "v^1.1#i^1# ... FXjEyODQ=",
//   "refresh_token_expires_in": 47304000,
//   "token_type": "User Access Token"
// }

$json = new CkJsonObject();
$success = $json->LoadFile('qa_data/tokens/ebay-access-token.json');
if ($success == false) {
    print 'Failed to load the existing ebay access token JSON.' . "\n";
    exit;
}

$oauth2 = new CkOAuth2();

$oauth2->put_TokenEndpoint('https://api.sandbox.ebay.com/identity/v1/oauth2/token');

// Replace these with actual values.
$oauth2->put_ClientId('EBAY_CLIENT_ID');
$oauth2->put_ClientSecret('EBAY_CLIENT_SECRET');

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

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

// Load the access token response into the JSON object 
$json->Load($oauth2->accessTokenResponse());

// 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.
$json->put_EmitCompact(false);
$json->WriteFile('qa_data/tokens/ebay-access-token.json');

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

?>