我是PHP開發(fā)的新手我正在嘗試通過實(shí)施一些有趣的真實(shí)項(xiàng)目來學(xué)習(xí)。因此，我嘗試構(gòu)建一個(gè)比特幣應(yīng)用程序，讓客戶可以用加密貨幣付款。所以我從Coinbase商業(yè)API開始我成功實(shí)現(xiàn)了收費(fèi)頁面，并且一切正常，直到到達(dá)必須處理WEBHOOKS的地步?我正在關(guān)注本文檔https://github.com/coinbase/coinbase-commerce-php/blob/master/README.md這就是WEBHOOKs的代碼`<?phprequire_once __DIR__ . "/vendor/autoload.php";use CoinbaseCommerce\Webhook;/** * To run this example please read README.md file * Past your Webhook Secret Key from Settings/Webhook section * Make sure you don't store your Secret Key in your source code! */$secret = 'SECRET_KEY';$headerName = 'X-Cc-Webhook-Signature';$headers = getallheaders();$signraturHeader = isset($headers[$headerName]) ? $headers[$headerName] : null;$payload = trim(file_get_contents('php://input'));try {    $event = Webhook::buildEvent($payload, $signraturHeader, $secret);    http_response_code(200);    echo sprintf('Successully verified event with id %s and type %s.', $event->id, $event->type);} catch (\Exception $exception) {    http_response_code(400);    echo 'Error occured. ' . $exception->getMessage();}`當(dāng)我訪問we hooks URL時(shí)，出現(xiàn)此錯(cuò)誤Error occured. Invalid payload provided. No JSON object could be decoded請(qǐng)?我希望有人向我解釋此錯(cuò)誤