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有人可以帮我弄这个吗。我是 Eddystone Beacon 的新手，这是我第一次使用 Google Cloud API（Proximity beacon api）。我正在尝试通过 Proximity Beacon API 向我注册的一个信标（可以在谷歌信标仪表板中完成）添加附近通知，并想知道为什么我会收到此错误：

{ "error": { "code": 400, "message": "Invalid JSON payload received. Unknown name \"{\"attachmentName\":\"beacon_eddystone\",\"data\":\"eyJ0aXRsZSI6IlNJTSBUZXN0IiwidXJsIjoiaHR0cDpcL1wvd3d3LnN1cmlnYW9pbnRlcm5ldG1hcmtldGluZy5jb20ifQ\": Cannot bind query parameter. Field '{\"attachmentName\":\"beacon_eddystone\",\"data\":\"eyJ0aXRsZSI6IlNJTSBUZXN0IiwidXJsIjoiaHR0cDpcL1wvd3d3LnN1cmlnYW9pbnRlcm5ldG1hcmtldGluZy5jb20ifQ' could not be found in request message.", "status": "INVALID_ARGUMENT", "details": [ { "@type": "type.googleapis.com/google.rpc.BadRequest","fieldViolations": [ { "description": "Invalid JSON payload received. Unknown name \"{\"attachmentName\":\"beacon_eddystone\",\"data\":\"eyJ0aXRsZSI6IlNJTSBUZXN0IiwidXJsIjoiaHR0cDpcL1wvd3d3LnN1cmlnYW9pbnRlcm5ldG1hcmtldGluZy5jb20ifQ\": Cannot bind query parameter. Field '{\"attachmentName\":\"beacon_eddystone\",\"data\":\"eyJ0aXRsZSI6IlNJTSBUZXN0IiwidXJsIjoiaHR0cDpcL1wvd3d3LnN1cmlnYW9pbnRlcm5ldG1hcmtldGluZy5jb20ifQ' could not be found in request message." } ] } ] } }

我在php中使用cURL创建了一个HttpRequest，代码如下：

$array = array();
$array['title'] = "SIM Test";
$array['url'] = "http://www.surigaointernetmarketing.com";
$data = base64_encode(json_encode($array));

//echo $data;

$curl = curl_init(); 

curl_setopt_array($curl, array( 
    CURLOPT_URL => 'https://proximitybeacon.googleapis.com/v1beta1/beacons/<my-beacon-name>/attachments?projectId=<my-project-id>', 
    CURLOPT_RETURNTRANSFER => true, 
    CURLOPT_ENCODING => "", 
    CURLOPT_MAXREDIRS => 10, 
    CURLOPT_TIMEOUT => 30, 
    CURLOPT_HTTP_VERSION => 
    CURL_HTTP_VERSION_1_1, 
    CURLOPT_CUSTOMREQUEST => 'POST', 
    CURLOPT_POSTFIELDS => '{"attachmentName":"beacon_eddystone","data":"'.$data.'","namespacedType":"com.google.nearby/en"}', 
    CURLOPT_HTTPHEADER => array( "authorization: Bearer <my-bearer-token>" ),)); 

$response = curl_exec($curl); 
$err = curl_error($curl); 
curl_close($curl); 

if ($err)
    echo "cURL Error #:" . $err; 
else
    echo $response;

我从这里得到了代码。并按照 Proximity Beacon REST API 入门中的说明进行操作。http请求体（CURLOPT_POSTFIELDS）一定有错误。我不知道为什么，请帮忙。

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