(PHP Extension) Auth0 Server-to-Server Access Token (Client Credentials flow)

Demonstrates how to obtain an Auth0 access token using client credentials (client_id and client_secret).

This is just a matter of duplicating this CURL command:

curl --request POST
  --url 'https://chilkat.auth0.com/oauth/token' \
  --header 'content-type: application/json' \
  --data '{"grant_type":"client_credentials","client_id": "xxxx","client_secret": "xxxx","audience": "https://api.example.com/geocoding/v1/"}'

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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.

// We want to duplicate this curl command:
// 
// curl --request POST
//   --url 'https://chilkat.auth0.com/oauth/token' \
//   --header 'content-type: application/json' \
//   --data '{"grant_type":"client_credentials","client_id": "my_client_id","client_secret": "my_client_secret","audience": "https://api.example.com/geocoding/v1/"}'

// Build the JSON body of the request.
$json = new CkJsonObject();
$json->UpdateString('grant_type','client_credentials');
$json->UpdateString('client_id','AUTH0-CLIENT-ID');
$json->UpdateString('client_secret','AUTH0-CLIENT-SECRET');
$json->UpdateString('audience','https://api.example.com/geocoding/v1/');

// IMPORTANT: You would use your own url.  You would not use "chilkat.auth0.com".  
// Instead you would use "your_name.auth0.com"
$http = new CkHttp();
// resp is a CkHttpResponse
$resp = $http->PostJson3('https://chilkat.auth0.com/oauth/token','application/json',$json);
if ($http->get_LastMethodSuccess() != true) {
    print $http->lastErrorText() . "\n";
    exit;
}

// A 200 response status code indicates success.  In the success case, the response body
// contains the JSON access token, such as: 
// {
//   "access_token": "eyJz93a...k4laUWw",
//   "token_type":"Bearer",
//   "expires_in":86400
// }
// 

print 'response status code = ' . $resp->get_StatusCode() . "\n";

// The repsonse is JSON if successful and also JSON for errors.
$jsonResp = new CkJsonObject();
$jsonResp->put_EmitCompact(false);
$jsonResp->Load($resp->bodyStr());

if ($resp->get_StatusCode() != 200) {
    // The response body contains error information in JSON format.
    print $jsonResp->emit() . "\n";

    // An example of an error response:
    // 		{
    // 		  "error": "access_denied",
    // 		  "error_description": "Client is not authorized to access \"https://api.example.com/geocoding/v1/\". You might probably want to create a \"client-grant\" associated to this API. See: https://auth0.com/docs/api/v2#!/Client_Grants/post_client_grants"
    // 		}
    exit;
}

print 'Success!' . "\n";
print $jsonResp->emit() . "\n";

// A successful JSON response body looks like this:

// {
//   "access_token": "eyJz93a...k4laUWw",
//   "token_type":"Bearer",
//   "expires_in":86400
// }


?>