Facebook Credit

最近在整合facebook credit，资源如下：

步骤：

1.新建应用和部署服务器，注意，测试服务器必须在公网，并且一定要保证facebook后台能够正确访问callback.php这个文件，localhost测试一直会报错：

The application you are using is not responding.

2.在facebook app设置里面，http://www.facebook.com/developers

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Edit Settings->Advanced->set "OAuth 2.0 for Canvas" to "Enabled"

Credits Tab, register your company && set your Credits Callback URL

3.get credit balance

这个问题其实我弄了好久，现在回想起来其实并不复杂，只是走了很多弯路，总结如下：

a.complete Credits Special Incentives Support,link

这个需要facebook审核，成功之后faceboo会给你发送邮件，接受邮件的地址就是你申请这个support的facebook账号的邮箱，这个要切记。

邮件的大概内容会是这样的：

In re-assessing your game's eligibility, we've enabled the requested app IDs for special incentives features testing: http://www.facebook.com/help/?faq=19840. 
 
Please notify us when your game is ready to launch Facebook Credits as your premium currency so that we can assess for distribution opportunities.

b.申请成功之后然后就可以写代码测试了

define('APP_ID', '');
define('API_KEY', '');
define('SECRET', '');
require_once("FacebookManager.php");
$facebook  = new FacebookManager(array(
      'appId'  =>  APP_ID,
      'secret' =>  SECRET,
      'cookie' =>  true
));
$user = $facebook->require_login("http://apps.facebook.com/xxx/","","email,publish_stream,user_birthday");

  $session = $facebook->getSession();

  $facebook_id = $facebook->getUser();

  $access_token = APP_ID.'|'.SECRET;  //注意此处的access_token，其实是app_token,不同于$session['access_token']

  $obj = json_decode( 
         file_get_contents('https://api.facebook.com/method/users.getStandardinfo'.
                           '?uids=' . $facebook_id . 
                           '&fields=credit_balance&access_token=' . $access_token . 
                           '&format=json'));

  echo '<pre>';
  print_r($obj);

c.如果出现:

The underlying FQL query made by this API call has encountered the following error: credit_balance is not a member of the user table

那是因为第一步没有通过，重新申请。

如果出现:

The method you are calling must be called with an app secret signed session

那就是混淆了access_token,在这里我们必须要使用

$access_token = APP_ID.'|'.SECRET;

或者：

$url = 'https://graph.facebook.com/oauth/access_token?grant_type=client_credentials&client_id='.$APP_ID.'&client_secret='.$FB_API_SECRET;
$access_token = @file_get_contents($url);

d.使用api调用来获取balance会报错

$credit_balance = $facebook->api(array('method'  => 'users.getStandardInfo','uids' => $facebook_id , 'fields' => 'credit_balance'));

这个暂时还没有找到解决办法

The application you are using is not responding.

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