问题 Paypal: Unable to Reauthorize Authorized Payment Below is my code $clientId = 'XXXXX'; $secret = 'XXXX'; $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, "https://api.sandbox.paypal.com/v1/oauth2/token"); curl_setopt($ch, CURLOPT_HEADER, false); curl_setopt($ch, CURLOPT_POST, true); curl_setopt($ch, CURLOPT_POSTFIELDS, "grant_type=client_credentials"); curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); curl_setopt($ch, CURLOPT_USERPWD, $clientId . ":" . $secret); $result = curl_exec($ch); if