api - Paypal Pro NVP Sandbox PHP Payment Impossible -

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i have build own paypal pro system don't work can't access template nvp ack success. i've tried change encoding nothing change. things

unable process payment. please contact merchant directly.
code :

    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 $key => $value) {     $request[] = "l_buttonvar".$i."=".$key."=".$value;     $i++; }  $requestcurl = "";  foreach ($request $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);

i've found solution problem i've replace "amount" "subtotal" , i've replace uppercase in lowercase in data array.

cordially


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