Instagram实时API标签订阅在30次回调后终止

我遇到了一个问题，我们创建的标签订阅只持续大约30次回调

我们使用PHP和cURL与实时API 对话

我们的callback.php只是将收到的POST请求记录到一个文件中，这样我们就可以跟踪它被调用的次数。大约30次调用后，它停止跟踪，当我们在API中查询订阅列表时，订阅ID和TAG不再被跟踪。。。然而，我们没有收到任何错误的回报，只是：

{"meta":{"code":200},"data":[]}

我们的subscribe.php如下：

<?php
    // client ids and secrets edited for posting
    $client_id = 'XXXXXXXXXXXXXXXXXXX';
    $client_secret = 'XXXXXXXXXXXXXXXXXXXXX';
    $object = 'tag';
    $object_id = $_GET['tag'];
    $aspect = 'media';
    $verify_token='';
    $callback_url = 'http://vslve.com/app/callback.php';
    $attachment =  array(
        'client_id' => $client_id,
        'client_secret' => $client_secret,
        'object' => $object,
        'object_id' => $object_id,
        'aspect' => $aspect,
        'verify_token' => $verify_token,
        'callback_url'=>$callback_url
    );
    $url = "https://api.instagram.com/v1/subscriptions/";
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL,$url);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $attachment);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);  //to suppress the curl output
    $result = curl_exec($ch);
    curl_close ($ch);

    $myString = $result;
    $jsonArray = json_decode($myString);
    foreach($jsonArray as $value){
        $sub_id = $value->id;
    }
    $content = " ".$sub_id." ".$object_id."'r'n";
    file_put_contents('subscribe.log', $content, FILE_APPEND);
    print_r($result);
?>

以及我们的回调.php

<?php
    $challenge = $_GET['hub_challenge'];
    if ($challenge) {
        echo $challenge;
    }else{
        sleep(2);
        $myString = file_get_contents('php://input');
        $jsonArray = json_decode($myString);
        foreach($jsonArray as $value){
            $sub_id = $value->subscription_id;
            $tag = $value->object_id;
            $content = " ".$sub_id." ".$tag." ".$url."'r'n";
            file_put_contents('activity.log', $content, FILE_APPEND);
        }// end foreach
    }// end if
?>

我们是不是以某种方式超过了利率限制？任何关于我们的订阅不断消失的原因的帮助都将是极好的。