Online Payment System using Paypal- PHP Script
Make a file name:”paypal.php”
<?php
require_once(‘paypal.class.php’); // include the class file
$p = new paypal_class; // initiate an instance
$p->paypal_url = “https://www.sandbox.paypal.com/cgi-bin/webscr”; //test url
//’https://www.paypal.com/cgi-bin/webscr’; // paypal url
$this_script = ‘http://’.$_SERVER[‘HTTP_HOST’].$_SERVER[‘PHP_SELF’];
// if no action variable, set ‘process’ as default action
if (empty($_GET[‘action’])) $_GET[‘action’] = ‘process’;
switch ($_GET[‘action’]) {
case ‘process’: // Process and order…
$p->add_field(‘business’, ‘PAYPAL EMAIL ADDRESS’);
$p->add_field(‘return’, $this_script.’?action=success’);
$p->add_field(‘cancel_return’, $this_script.’?action=cancel’);
$p->add_field(‘notify_url’, $this_script.’?action=ipn’);
$p->add_field(‘item_name’, ‘PAYPAL TEST’); // ‘ITEM NAME’
$p->add_field(‘amount’, ‘100’); // ‘ITEM AMOUNT’
$p->add_field(‘currency_code’, ‘USD’);//CURRENCY VALUE USD/EUR…
$p->submit_paypal_post(); // submit the fields to paypal
break;
case ‘success’: // successful order…
echo “<html>
<head><title>Success….</title></head>
<body>
<h2>Thank you for your order!</h2>”;
foreach ($_POST as $key => $value) {
echo “$key: $value<br>”;
}
echo “</body></html>”;
break;
case ‘cancel’: // Canceled Order…
echo “<html>
<head><title>Canceled</title></head>
<body><h2>The order was canceled.</h2>”;
echo “</body></html>”;
break;
case ‘ipn’: // For IPN validation…
if ($p->validate_ipn()) {
$subject = ‘Instant Payment Notification – Recieved Payment’;
$to = ‘EMAIL ADDRESS’;
$body=”An instant payment notification was successfully recieved\n”;
$body .= “from “.$p->ipn_data[‘payer_email’].” on “.date(‘m/d/Y’);
$body .= “\n\nDetails:\n”;
foreach ($p->ipn_data as $key => $value) {
$body .= “\n$key: $value”;
}
@mail($to, $subject, $body);
}
break;
}
?>
Make another file: “paypal.class.php”
<?php
/********* PayPal with IPN in PHP **********/
class paypal_class {
var $error; // holds the error encountered
var $ipn_log; // log IPN results
var $ipn_log_file; // filename of the IPN log
var $ipn_response; // holds the IPN response from PayPal
var $ipn_data = array(); // contains the POST values for IPN
var $fields = array(); // holds the fields to submit to PayPal
function paypal_class() {
// constructor.
$this->paypal_url = ‘https://www.paypal.com/cgi-bin/webscr’;
$this->error = ”;
$this->ipn_log_file = ‘.ipn_results.log’;
$this->ipn_log = true;
$this->ipn_response = ”;
$this->add_field(‘rm’,’2′); // Return method = POST
$this->add_field(‘cmd’,’_xclick’);
}
function add_field($field, $value) {
// adds a key=>value pair to the fields array
$this->fields[“$field”] = $value;
}
function submit_paypal_post() {
// generates an HTML page consisting of
// a form with hidden elements which is submitted to PayPal
echo “<html>\n”;
echo “<head><title>Processing…</title></head>\n”;
echo “<body onLoad=\”document.forms[‘paypal_form’].submit();\”>\n”;
echo “<center><h2>Please wait, your order is being processed and you”;
echo ” will be redirected to the paypal website…..</h2></center>\n”;
echo “<form method=\”post\” name=\”paypal_form\” “;
echo “action=\””.$this->paypal_url.”\”>\n”;
foreach ($this->fields as $name => $value) {
echo “<input type=\”hidden\” name=\”$name\” value=\”$value\”/>\n”;
}
echo “<center><br/><br/>If you are not automatically redirected to “;
echo “paypal within 5 seconds…<br/><br/>\n”;
echo “<input type=\”submit\” value=\”Click Here\”></center>\n”;
echo “</form>\n”;
echo “</body></html>\n”;
}
function validate_ipn() {
// parse the paypal URL
$url_parsed=parse_url($this->paypal_url);
// generate the post string from the _POST vars
$post_string = ”;
foreach ($_POST as $field=>$value) {
$this->ipn_data[“$field”] = $value;
$post_string .= $field.’=’.urlencode (stripslashes ($value)).’&’;
}
$post_string. =”cmd=_notify-validate”;
// open the connection to paypal
$fp = fsockopen($url_parsed[host],”80″,$err_num,$err_str,30);
if(!$fp) {
// Print the error if not able to open the connection.
$this->error = “Error no. $errnum: $errstr”;
$this->log_ipn_results(false);
return false;
} else {
// Post data back to paypal
fputs($fp, “POST $url_parsed[path] HTTP/1.1\r\n”);
fputs($fp, “Host: $url_parsed[host]\r\n”);
fputs($fp, “Content-type: application/x-www-form-urlencoded\r\n”);
fputs($fp, “Content-length: “.strlen($post_string).”\r\n”);
fputs($fp, “Connection: close\r\n\r\n”);
fputs($fp, $post_string . “\r\n\r\n”);
// loop through the response from the server and append to variable
while(!feof($fp)) {
$this->ipn_response .= fgets($fp, 1024);
}
fclose($fp); // close connection
}
if (eregi(“VERIFIED”,$this->ipn_response)) {
// Valid IPN.
$this->log_ipn_results(true);
return true;
} else {
// Invalid IPN.
$this->error = ‘IPN Validation Failed.’;
$this->log_ipn_results(false);
return false;
}
}
function log_ipn_results($success) {
if (!$this->ipn_log) return;
// Timestamp
$text = ‘[‘.date(‘m/d/Y g:i A’).’] – ‘;
// Success or failure
if ($success) $text .= “SUCCESS!\n”;
else $text .= ‘FAIL: ‘.$this->error.”\n”;
// Log the POST variables
$text .= “IPN POST Values from Paypal:\n”;
foreach ($this->ipn_data as $key=>$value) {
$text .= “$key=$value, “;
}
// response from the paypal server
$text .= “\nIPN Response from Paypal Server:\n “.$this->ipn_response;
// Write to log
$fp=fopen($this->ipn_log_file,’a’);
fwrite($fp, $text . “\n\n”);
fclose($fp); // close file
}
}
?>
