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如果在场景中向买家点击'取消并返回到xxx商店'，我可以获取发回参数吗？下面的代码是我想有回发PARAMS买家后回声出单击取消时须肢webscr过程：如果回复失败，PayPal如何获得回传参数
$req = 'cmd=_notify-synch';
$pp_hostname = "www.sandbox.paypal.com";
$tx_token = $_GET['tx'];
$auth_token = "Ti-bfX-sv-zNDXZS";
$req .= "&tx=".$tx_token."&at=".$auth_token;
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "https://".$pp_hostname."/cgi-bin/webscr");
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $req);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 1);
//set cacert.pem verisign certificate path in curl using 'CURLOPT_CAINFO' field here,
//if your server does not bundled with default verisign certificates.
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
curl_setopt($ch, CURLOPT_HTTPHEADER, array("Host: ".$pp_hostname));
$res = curl_exec($ch);
curl_close($ch);
if(!$res){
//HTTP ERROR
}else{
// parse the data
$lines = explode("\n", $res);
$keyarray = array();
if(strcmp($lines[0], "SUCCESS") == 0){
for($i=1; $i<count($lines);$i++){
list($key,$val) = explode("=", $lines[$i]);
$keyarray[urldecode($key)] = urldecode($val);
}
//process payment
}else if(strcmp($lines[0], "FAIL") == 0){
$lines = explode("\n", $res);
$keyarray = array();
for($i=1; $i<count($lines);$i++){
list($key,$val) = explode("=", $lines[$i]);
$keyarray[urldecode($key)] = urldecode($val);
}
// echo post back params if FAIL
echo "<p><h3>Transaction ".$keyarray['payment_status']."!</h3></p>";
}
}
那是有可能得到回应是否发布FAIL回PARAMS？如果买方取消交易，我需要一些数据来处理数据库。
谢谢。