Donations IPN Paypal

Question

I have a website with wordpress 1 page, which has the ability to upload a music track after donating to PayPal - with a minimum amount of $ 3.99.

the button works fine, and payment through paypal goes through, but I only return INVALID from PayPal - it does not seem to return the contents for the correct payment.

Also - How can I see PayPal sending me back?

Any help is much appreciated!

inside the included php file:

<?php echo "<p class='small-donate'>Minimum ammount for donation is $3.99</p> <form method='POST' action='' target='_top'> $<input type='text' name='donate_amount' value='0' size='4' class='donate-input'> <input type='submit' name='submit' value='Donate' class='donate-submit'></form>"; if(!empty($_POST['submit'])) { // Form has been submitted if($_POST['donate_amount'] >= 3.99) { // Redirect to PayPal $myurl = site_url(); $fileurl = site_url('wp-content/themes/MY_THEME/content-download-file.php'); header('Location: https://www.sandbox.paypal.com/cgi-bin/webscr?cmd=_donations&item_name=Donation for music track&amount='.$_POST['donate_amount'].'&currency_code=USD&business=MY_SANDBOX_TEST_EMAIL&cbt=Download the file&return='.$fileurl.'&cancel_return='.$myurl); } else { echo '<span class="error">Donation must be at least $3.99</span>'; } } ?> 

inside content-download-file.php

(I got it from PayPal developers)

 <?php // STEP 1: read POST data // Reading POSTed data directly from $_POST causes serialization issues with array data in the POST. // Instead, read raw POST data from the input stream. $raw_post_data = file_get_contents('php://input'); $raw_post_array = explode('&', $raw_post_data); $myPost = array(); foreach ($raw_post_array as $keyval) { $keyval = explode ('=', $keyval); if (count($keyval) == 2) $myPost[$keyval[0]] = urldecode($keyval[1]); } // read the IPN message sent from PayPal and prepend 'cmd=_notify-validate' $req = 'cmd=_notify-validate'; if(function_exists('get_magic_quotes_gpc')) { $get_magic_quotes_exists = true; } foreach ($myPost as $key => $value) { if($get_magic_quotes_exists == true && get_magic_quotes_gpc() == 1) { $value = urlencode(stripslashes($value)); } else { $value = urlencode($value); } $req .= "&$key=$value"; } // Step 2: POST IPN data back to PayPal to validate $ch = curl_init('https://www.sandbox.paypal.com/cgi-bin/webscr'); curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1); curl_setopt($ch, CURLOPT_POST, 1); curl_setopt($ch, CURLOPT_RETURNTRANSFER,1); curl_setopt($ch, CURLOPT_POSTFIELDS, $req); curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 1); curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2); curl_setopt($ch, CURLOPT_FORBID_REUSE, 1); curl_setopt($ch, CURLOPT_HTTPHEADER, array('Connection: Close')); // In wamp-like environments that do not come bundled with root authority certificates, // please download 'cacert.pem' from "http://curl.haxx.se/docs/caextract.html" and set // the directory path of the certificate as shown below: // curl_setopt($ch, CURLOPT_CAINFO, dirname(__FILE__) . '/cacert.pem'); curl_setopt($ch, CURLOPT_CAINFO, dirname(__FILE__) . '/cacert.pem'); if( !($res = curl_exec($ch)) ) { //error_log("Got " . curl_error($ch) . " when processing IPN data"); curl_close($ch); exit; } curl_close($ch); // inspect IPN validation result and act accordingly if (strcmp ($res, "VERIFIED") == 0) { echo '<section id="download"> <h2>Download song</h2> <a href="FILE_PATH">FILE Here</a> </section>'; } else if (strcmp ($res, "INVALID") == 0) { echo "The response from IPN was: <b>" .$res ."</b>"; } ?> 

Answer 1

Here is the script I mentioned:

 <?php // 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/1.1\r\n"; // If testing on Sandbox use: $header .= "Host: www.sandbox.paypal.com\r\n"; $header .= "Connection: close\r\n"; //$header .= "Host: www.paypal.com:443\r\n"; $header .= "Content-Type: application/x-www-form-urlencoded\r\n"; $header .= "Content-Length: " . strlen($req) . "\r\n\r\n"; // If testing on Sandbox use: $fp = fsockopen ('ssl://www.sandbox.paypal.com', 443, $errno, $errstr, 30); // 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 = $_POST['payer_email']; if (!$fp) { // HTTP ERROR } else { fputs ($fp, $header . $req); while (!feof($fp)) { $res = fgets ($fp, 1024); if (strcmp (trim($res), "VERIFIED") == 0) { // check the payment_status is Completed // check that txn_id has not been previously processed // check that receiver_email is your Primary PayPal email // check that payment_amount/payment_currency are correct // process payment $mail_From = "From: address-here"; $mail_To = "address-here"; $mail_Subject = "VERIFIED IPN"; $mail_Body = $req; //error_log($res, 1, "address-here"); foreach ($_POST as $key => $value){ $emailtext .= $key . " = " .$value ."\n\n"; } mail($mail_To, $mail_Subject, $emailtext . "\n\n" . $mail_Body, $mail_From); } else if (strcmp (trim($res), "INVALID") == 0) { $mail_From = "From: address-here"; $mail_To = "address-here"; $mail_Subject = "INVALID IPN"; $mail_Body = $req; //error_log($res, 1, "address-here"); foreach ($_POST as $key => $value){ $emailtext .= $key . " = " .$value ."\n\n"; } mail($mail_To, $mail_Subject, $emailtext . "\n\n" . $mail_Body, $mail_From); } } fclose ($fp); } ?> 

In the "address-here" sections, you must add the appropriate email address. This sends everything back to PayPal, and it just returned the “VERIFIED” response.

Now everything is set for the Sandbox.