我有一个电子书销售网站,用户可以在购买后下载一本书。我从PayPal收到一个IPN,据我所知,有时如果用户选择信用卡作为支付方法,付款状态就“正在进行”或“处理”。由于PayPal然后将重新发送IPN时,付款完成,什么是最好的方式来检查付款状态是否完成,以避免重复在您的数据库中?
最佳答案
这是Paypal返回给你的IPN听众的可能状态。
Canceled_Reversal
Completed
Denied
Failed
Refunded
Reversed
Voided
In-Progress
Pending
Processed
你应该检查
Completed
状态以便确保付款完成。下面是检查不同状态的IPN Listener
示例<?php
//Build the data to post back to Paypal
$postback = 'cmd=_notify-validate';
// go through each of the posted vars and add them to the postback variable
foreach ($_POST as $key => $value) {
$value = urlencode(stripslashes($value));
$postback .= "&$key=$value";
}
// build the header string to 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";
$header .= "Content-Length: " . strlen($postback) . "\r\n\r\n";
// Send to paypal or the sandbox depending on whether you're live or developing
// comment out one of the following lines
//$fp = fsockopen ('ssl://www.sandbox.paypal.com', 443, $errno, $errstr, 30);//open the connection
$fp = fsockopen ('ssl://www.paypal.com', 443, $errno, $errstr, 30);
// or use port 443 for an SSL connection
//$fp = fsockopen ('ssl://www.paypal.com', 443, $errno, $errstr, 30);
if (!$fp)
{
// HTTP ERROR Failed to connect
//error handling or email here
}
else // if we've connected OK
{
fputs ($fp, $header . $postback);//post the data back
while (!feof($fp))
{
$response = fgets ($fp, 1024);
if (strcmp ($response, "VERIFIED") == 0) //It's verified
{
// assign posted variables to local variables, apply urldecode to them all at this point as well, makes things simpler later
$payment_status = $_POST['payment_status'];//read the payment details and the account holder
if($payment_status == 'Completed')
{
//Do something
}
else if($payment_status == 'Denied' || $payment_status == 'Failed' || $payment_status == 'Refunded' || $payment_status == 'Reversed' || $payment_status == 'Voided')
{
//Do something
}
else if($payment_status == 'In-Progress' || $payment_status == 'Pending' || $payment_status == 'Processed')
{
//Do something
}
else if($payment_status == 'Canceled_Reversal')
{
//Do something
}
}
else if (strcmp ($response, "INVALID") == 0)
{
//the Paypal response is INVALID, not VERIFIED
}
} //end of while
fclose ($fp);
}
?>