我想用我的PHP应用程序实现Paypal支付集成（Sandbox），我正在使用以下方法。
http://www.evoluted.net/thinktank/web-development/paypal-php-integration
付款成功，在成功完成交易后显示成功消息“BAD GATEWAY”错误即将到来。下面指出的有问题的部分
以下代码
$paypal_email = 'paypal@example.com'; ---> I gave my registered Sandbox user id.
$return_url = 'http://example.com/payment-successful.htm';
$cancel_url = 'http://example.com/payment-cancelled.htm';
$notify_url = 'http://example.com/paypal/payments.php';
仅在以下链接中显示BAD网关。
http://example.com/payment-successful.htm
我在Stackoverflow.com上研究并在paypal帐户资料中给出了预先通知设置的建议，我也这样做了，但没有运气。
欢迎任何输入
此致 维克拉姆。
我也添加了编码部分。
index.html
<form class="paypal" action="payments.php" method="post" id="paypal_form" target="_blank">
<input type="hidden" name="cmd" value="_xclick" />
<input type="hidden" name="no_note" value="1" />
<input type="hidden" name="lc" value="UK" />
<input type="hidden" name="currency_code" value="GBP" />
<input type="hidden" name="bn" value="PP-BuyNowBF:btn_buynow_LG.gif:NonHostedGuest" />
<input type="hidden" name="first_name" value="Customer's First Name" />
<input type="hidden" name="last_name" value="Customer's Last Name" />
<input type="hidden" name="payer_email" value="customer@example.com" />
<input type="hidden" name="item_number" value="123456" / >
<input type="submit" value="Submit Payment"/>
</form>
Payments.php
<?php
// Database variables
$host = "localhost"; //database location
$user = "root"; //database username
$pass = "root"; //database password
$db_name = "test_paypal"; //database name
// PayPal settings
$paypal_email = ' '; - My Email
$return_url = 'http://example.com/payment-successful.PHP';
$cancel_url = 'http://example.com/payment-cancelled.htm';
$notify_url = 'http://example.com/paypal/payments.php';
$item_name = 'Test Item';
$item_amount = 5.00;
// Include Functions
include("functions.php");
//Database Connection
$link = mysql_connect($host, $user, $pass);
mysql_select_db($db_name);
// Check if paypal request or response
if (!isset($_POST["txn_id"]) && !isset($_POST["txn_type"])){
// Firstly Append paypal account to querystring
$querystring .= "?business=".urlencode($paypal_email)."&";
// Append amount& currency (£) to quersytring so it cannot be edited in html
//The item name and amount can be brought in dynamically by querying the $_POST['item_number'] variable.
$querystring .= "item_name=".urlencode($item_name)."&";
$querystring .= "amount=".urlencode($item_amount)."&";
//loop for posted values and append to querystring
foreach($_POST as $key => $value){
$value = urlencode(stripslashes($value));
$querystring .= "$key=$value&";
}
// Append paypal return addresses
$querystring .= "return=".urlencode(stripslashes($return_url))."&";
$querystring .= "cancel_return=".urlencode(stripslashes($cancel_url))."&";
$querystring .= "notify_url=".urlencode($notify_url);
// Append querystring with custom field
//$querystring .= "&custom=".USERID;
// Redirect to paypal IPN
header('location:https://www.sandbox.paypal.com/cgi-bin/webscr'.$querystring);
exit();
}else{
// Response from Paypal
// read the post from PayPal system and add 'cmd'
$req = 'cmd=_notify-validate';
foreach ($_POST as $key => $value) {
$value = urlencode(stripslashes($value));
$value = preg_replace('/(.*[^%^0^D])(%0A)(.*)/i','${1}%0D%0A${3}',$value);// IPN fix
$req .= "&$key=$value";
}
// assign posted variables to local variables
$data['item_name'] = $_POST['item_name'];
$data['item_number'] = $_POST['item_number'];
$data['payment_status'] = $_POST['payment_status'];
$data['payment_amount'] = $_POST['mc_gross'];
$data['payment_currency'] = $_POST['mc_currency'];
$data['txn_id'] = $_POST['txn_id'];
$data['receiver_email'] = $_POST['receiver_email'];
$data['payer_email'] = $_POST['payer_email'];
$data['custom'] = $_POST['custom'];
// post back to PayPal system to validate
$header = "POST /cgi-bin/webscr HTTP/1.0\r\n";
$header .= "Content-Type: application/x-www-form-urlencoded\r\n";
$header .= "Content-Length: " . strlen($req) . "\r\n\r\n";
$fp = fsockopen ('ssl://www.sandbox.paypal.com', 443, $errno, $errstr, 30);
if (!$fp) {
// HTTP ERROR
} else {
fputs ($fp, $header . $req);
while (!feof($fp)) {
$res = fgets ($fp, 1024);
echo $res;
if (strcmp($res, "VERIFIED") == 0) {
// Used for debugging
//@mail("you@youremail.com", "PAYPAL DEBUGGING", "Verified Response<br />data = <pre>".print_r($post, true)."</pre>");
// Validate payment (Check unique txnid & correct price)
$valid_txnid = check_txnid($data['txn_id']);
$valid_price = check_price($data['payment_amount'], $data['item_number']);
// PAYMENT VALIDATED & VERIFIED!
if($valid_txnid && $valid_price){
$orderid = updatePayments($data);
if($orderid){
// Payment has been made & successfully inserted into the Database
}else{
// Error inserting into DB
// E-mail admin or alert user
}
}else{
// Payment made but data has been changed
// E-mail admin or alert user
}
}else if (strcmp ($res, "INVALID") == 0) {
// PAYMENT INVALID & INVESTIGATE MANUALY!
// E-mail admin or alert user
// Used for debugging
//@mail("you@youremail.com", "PAYPAL DEBUGGING", "Invalid Response<br />data = <pre>".print_r($post, true)."</pre>");
}
}
fclose ($fp);
}
}
?>
functions.php
<?php
// functions.php
function check_txnid($tnxid){
global $link;
return true;
$valid_txnid = true;
//get result set
$sql = mysql_query("SELECT * FROM `payments` WHERE txnid = '$tnxid'", $link);
if($row = mysql_fetch_array($sql)) {
$valid_txnid = false;
}
return $valid_txnid;
}
function check_price($price, $id){
$valid_price = false;
//you could use the below to check whether the correct price has been paid for the product
/*
$sql = mysql_query("SELECT amount FROM `products` WHERE id = '$id'");
if (mysql_numrows($sql) != 0) {
while ($row = mysql_fetch_array($sql)) {
$num = (float)$row['amount'];
if($num == $price){
$valid_price = true;
}
}
}
return $valid_price;
*/
return true;
}
function updatePayments($data){
global $link;
echo $data;
if(is_array($data)){
$sql = mysql_query("INSERT INTO `payments` (txnid, payment_amount, payment_status, itemid, createdtime) VALUES (
'".$data['txn_id']."' ,
'".$data['payment_amount']."' ,
'".$data['payment_status']."' ,
'".$data['item_number']."' ,
'".date("Y-m-d H:i:s")."'
)", $link);
return mysql_insert_id($link);
}
}
?>
payment-successful.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Payment Successful</title>
</head>
<body>
<h1>Thank You</h1>
<p>Your payment was successful. Thank you.</p>
</body>
</html>