Paypal Pro NVP沙盒PHP支付不可能

我已经建立了自己的Paypal Pro系统，但他不工作，我无法访问模板，但NVP确认成功。我试过更改编码，但没有什么可更改的。我唯一得到的是

无法处理您的付款。请直接与商家联系

    session_start();
    $total = 0;
    $total = $_SESSION['navig']->commande->total;
    $total -= $_SESSION["navig"]->commande->remise;
// R?f?rence
$Reference_Cde = urlencode($_SESSION['navig']->commande->transaction);
// Montant
$Montant = $total;
// Récupération de l'adresse de payement
$server = $serveur_api;
$version = "87.0";
$method = "BMCreateButton";
$user = $username_api;
$pwd = $password_api;
$signature = $key_api;
$buttoncode = "TOKEN";
$buttontype = "PAYMENT";
$data = array(
    "PAYMENTACTION" => urlencode("sale"),
    "AMOUNT"        => urlencode(round($Montant, 2)),
    "TAX"           => urlencode("19.6"),
    "FIRST_NAME"    => urlencode($_SESSION["navig"]->client->prenom),
    "LASR_NAME"     => urlencode($_SESSION["navig"]->client->nom),
    "ADDRESS1"      => urlencode($_SESSION["navig"]->client->adresse1),
    "ADDRESS2"      => urlencode($_SESSION["navig"]->client->adresse2),
    "CITY"          => urlencode($_SESSION["navig"]->client->ville),
    "ZIP"           => urlencode($_SESSION["navig"]->client->cpostal),
    "EMAIL"         => urlencode($_SESSION["navig"]->client->email),
    "SHIPPING_1"    => urlencode($_SESSION["navig"]->commande->port),
    "CURRENCY_CODE" => urlencode($Devise),
    "PAYER_ID"      => urlencode($_SESSION["navig"]->client->id),
    "PAYER_EMAIL"   => urlencode($_SESSION["navig"]->client->email),
    "RETURN"        => urlencode($retourok),
    "NOTIFY_URL"    => urlencode($confirm),
    "CANCEL_RETURN" => urlencode($retournok),
    "INVOICE"       => urlencode($Reference_Cde)
);
$request[] = "VERSION=".$version;
$request[] = "METHOD=".$method;
$request[] = "USER=".$user;
$request[] = "PWD=".$pwd;
$request[] = "SIGNATURE=".$signature;
$request[] = "BUTTONCODE=".$buttoncode;
$request[] = "BUTTONTYPE=".$buttontype;
$i = 0;
foreach ($data as $key => $value) {
    $request[] = "L_BUTTONVAR".$i."=".$key."=".$value;
    $i++;
}
$requestcurl = "";
foreach ($request as $data => $value) {
    $requestcurl .= $value . "&";
}
$requestcurl = substr($requestcurl, 0, -1);
$requestcurl = str_replace(" ", "+", $requestcurl);
$requestcurl = utf8_encode($requestcurl);
$url = parse_url($serveur_api);
$reponse = "";
$fp = fsockopen("ssl://".$url['host'],"443",$err_num,$err_str,30); 
if(!$fp) {
     return false;
 } else { 
   fputs($fp, "POST $url[path] HTTP/1.1'r'n"); 
   fputs($fp, "Host: $url[host]'r'n"); 
   fputs($fp, "Content-type: application/x-www-form-urlencoded'r'n"); 
   fputs($fp, "Content-length: ".strlen($requestcurl)."'r'n");
   fputs($fp, "Charset: utf-8'r'n");
   fputs($fp, "Connection: close'r'n'r'n"); 
   fputs($fp, $requestcurl . "'r'n'r'n"); 
   while(!feof($fp))  
      $reponse .= fgets($fp, 4096); 
   fclose($fp); 
};
$rep = explode("&", $reponse);
$rep = explode("=", $rep[1]);
$result = urldecode($rep[1]);
header("Location:".$result);