QuickBooks Oauth 2.0获取访问令牌时返回无效请求错误

Question

我正在尝试使用Oath 2.0授权速记本。我已经完成了授权，现在尝试获取访问令牌。但是在发出POST请求以获取访问令牌时，我收到“无效的请求错误”。

`$adminUrl="https://oauth.platform.intuit.com/oauth2/v1/tokens/bearer";
$client_id='Q0ble08jhv8hvQwLbBo******************';
$client_secret='ewHQsRokdOhOjcNHpt7wH***********';
$redirect_url='http://localhost/quickbooks/testaccesstoken.php';
//According to Quickbooks API need to pass Authorization Header//
 $authorizationToken=base64_encode($client_id."".$client_secret);
//Curl Post Request//
$ch = curl_init();
$data = array("code" =>$code,"redirect_uri"=>$redirect_url,"grant_type"=>"authorization_code");
$headers = array();
$ch = curl_init($adminUrl);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($ch, CURLOPT__TIMEOUT, "30");
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Authorization:Basic' .$authorizationToken,'Content-Type: application/x-www-form-urlencoded','Accept: application/json'));
$token = curl_exec($ch);

{“错误”：“ invalid_request”}