aypal支付原理
首先根據paypal的要求構造出一個表單，然後送出到paypal去處理，paypal處理後會以隐藏方式post資料到商家網站指定的頁面，在商家網站指定的頁面，我們先要把payapal的post到該頁面上的值進行處理，然後再投遞到paypal上去驗證，如果是正确的，則paypal會傳回VERIFIED，否則傳回INVALID.
看不懂原理沒有關系，直接看代碼。
下面是構造的送出到PAYPAL得表單。
<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0Transitional//EN”“http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd”>
<htmlxmlns=”http://www.w3.org/1999/xhtml”>
<head>
<meta http-equiv=”Content-Type” content=”text/html;charset=utf-8″ />
<title>無标題文檔</title>
</head>
<body>
<form style=”text-align:center;”action=”https://www.sandbox.paypal.com/cgi-bin/webscr”method=”post”>
<input type=’hidden’ name=’cmd’value=’_xclick’>
<input type=’hidden’ name=’business’value=’[email protected]’>
<input type=’hidden’ name=’item_name’value=’201001114262121′>
<input type=’hidden’ name=’amount’value=’1.00′>
<input type=’hidden’ name=’currency_code’value=’USD’>
<input type=’hidden’ name=’return’value=’http://www.xxx.com/return.php’>
<input type=’hidden’ name=’invoice’value=’82′>
<input type=’hidden’ name=’charset’value=’utf-8′>
<input type=’hidden’ name=’no_shipping’value=’1′>
<input type=’hidden’ name=’no_note’value=”>
<input type=’hidden’ name=’notify_url’value=’http://www.xxx.com/return.php’>
<input type=’hidden’ name=’rm’value=’82′>
<input type=’hidden’ name=’cancel_return’value=’http://www.xxx.com/index.html’>
<input type=’submit’ value=’立即使用 paypal支付’>
</form>
</body>
</html>
下面是處理代碼：
<?php
$merchant_id = ’[email protected]’; ///擷取商戶paypal賬戶
// read the post from PayPal system and add ‘cmd’
$req = ‘cmd=_notify-validate’;
foreach ($_POST as $key => $value)
{
$value = urlencode(stripslashes($value));
$req .= “&$key=$value”;
}
// 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 (‘www.sandbox.paypal.com’, 80, $errno, $errstr,30); //如果是測試賬戶，則投遞到www.sandbox.paypal.com，否則投遞到www.paypal.com
// assign posted variables to local variables
$item_name = $_POST['item_name'];
$item_number = $_POST['item_number'];
$payment_status = $_POST['payment_status'];
$payment_amount = $_POST['mc_gross'];
$payment_currency = $_POST['mc_currency'];
$txn_id = $_POST['txn_id'];
$receiver_email = $_POST['receiver_email'];
$payer_email = $_POST['payer_email'];
$order_sn = $_POST['invoice'];
$memo = !empty($_POST['memo']) ? $_POST['memo'] : ”;
//$action_note = $txn_id . ‘（’ . $GLOBALS['_LANG']['paypal_txn_id']. ‘）’ . $memo;
if (!$fp)
{
fclose($fp);
return false;
}
else
{
fputs($fp, $header . $req);
while (!feof($fp))
{
$res = fgets($fp, 1024);
if (strcmp($res, ‘VERIFIED’) == 0)
{
//付款成功的代碼
}
elseif (strcmp($res, ‘INVALID’) == 0)
{
//付款失敗的代碼
fclose($fp);
return false;
}
}
}
需要注意的是上面是用的paypal的sandbox.
原文位址：http://paypal999.blog.163.com/blog/static/13737488320107306370292/
![Centos 7 Apache配置虛拟主機[圖]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)