Внутренняя ошибка сервера API LendingClub.com для покупки заметок на вторичном рынке

<?php
$invester_id = "516xxxxxx";
$api_key = "GVsZuxxxxxxxxx";
$ContentType = "application/json";
define("DEBUG_LENDING_API", true);

$buy = buy_notes($invester_id, $api_key);
print_r($buy);die;

function buy_notes($invester_id, $api_key){
$buy_notes_url = "https://api.lendingclub.com/api/investor/v1/accounts/$invester_id/trades/buy";
$note = array("loanId" => "97277470", "orderId" => "139320895", "noteID" => "149206918", "bidPrice" => "19.45");
$datas = array("aid" => "70654", "notes" => $note);
$buy_notes = call_curl($buy_notes_url, $api_key, json_encode($datas));
$notes = json_decode($buy_notes['data']);
return $notes;
}

function call_curl($url, $api_key, $post = "0"){
$invester_id = "516xxxxxx";
$ContentType = "application/json";
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt ( $ch, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows; U; Windows NT 5.1; pl; rv:1.9) Gecko/2008052906 Firefox/3.0" );
if($post != "0"){
curl_setopt($ch,CURLOPT_POST, 1);
curl_setopt($ch,CURLOPT_POSTFIELDS, $post);
}
curl_setopt ( $ch, CURLOPT_AUTOREFERER, true );
curl_setopt ( $ch, CURLOPT_FOLLOWLOCATION, true );
$headers = array();
$headers[] = "Authorization: $api_key";
$headers[] = "Content-type: $ContentType";
$headers[] = "Accept: $ContentType";
$headers[] = "X-LC-Application-Key: $invester_id";
//print_r(array_values($headers));
//exit;
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
$server_output = curl_exec ($ch);
echo $server_output. "<br>";
exit;
$info = curl_getinfo($ch);
curl_close ($ch);
if(DEBUG_LENDING_API == true){
return array("data" => $server_output, "response" => $info);
}else{
return json_decode($server_output);
}
}
?>