php - paypal付款成功后如何获取后值

Question

我遵循简单的 PHP 代码进行 Paypal 集成

这是我的代码，

<form action="<?php echo $paypal_url; ?>" method="post">
        <input type="hidden" name="business" value="<?php echo $paypal_id; ?>">

        <input type="hidden" name="cmd" value="_xclick">

        <input type="hidden" name="item_name" value="<?php echo $row['name']; ?>">
        <input type="hidden" name="item_number" value="<?php echo $row['id']; ?>">
        <input type="hidden" name="amount" value="<?php echo $row['price']; ?>">
        <input type="hidden" name="currency_code" value="USD">

        <input type='hidden' name='cancel_return' value='http://localhost/paypal_integration_php/cancel.php'>
        <input type='hidden' name='return' value='http://localhost/paypal_integration_php/success.php'>

        <input type="image" name="submit" border="0"
        src="https://www.paypalobjects.com/en_US/i/btn/btn_buynow_LG.gif" alt="PayPal - The safer, easier way to pay online">
        <img alt="" border="0" width="1" height="1" src="https://www.paypalobjects.com/en_US/i/scr/pixel.gif" >

    </form>

而且， 这是Success.php

<?php
include 'db_config.php';

$item_number = $_REQUEST['item_number']; 
$txn_id = $_REQUEST['tx'];
$payment_gross = $_REQUEST['amount'];
$currency_code = $_REQUEST['currency_code'];
$payment_status = $_REQUEST['st'];
?>

但是当返回我的成功文件时，我收到了这样的错误，

我不清楚 IPN 和 PDT 概念clearlry..

Answer 1

试试这个

$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'];

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