Paypal Response Received "Fail"

Question

I integrate paypal into my cart Here is my form of transferring value

<h3>By Paypal</h3><hr/> <label>Click Here</label> <br/> <?php include 'controller/connection.php'; $paypal_url = 'https://www.sandbox.paypal.com/cgi-bin/webscr'; $paypal_id = ' [e-mail] '; $cancel_url = 'http://my-website/index.php?action=cancel'; $return_url = 'http://my-website/store.php'; $i = 0; $products = array(); $qry = mysql_query("select * from temp_cart where tokenId='$token'"); while ($row = mysql_fetch_array($qry)) { $pid = $row[0]; $pname = $row[1]; $qty = $row[3]; $price = $row[4]; $amount = $row[5]; $products[] = array('pid' => $pid, 'pname' => $pname, 'qty' => $qty, 'price' => $price, 'amount' => $amount); } ?> <form action="<?php echo $paypal_url;?>" method="post"> <input type="hidden" name="cmd" value="_cart"> <input type="hidden" name="upload" value="1"> <input type="hidden" name="add" value="1"> <input type="hidden" name="business" value="<?php echo $paypal_id;?>"> <?php foreach ($products as $product) { $i++; //echo $product['amount']; ?> <input type="hidden" name="item_name_<?php echo $i;?>" value="<?php echo $product['pname']?>"> <input type='hidden' name='item_number_<?php echo $i;?>' value='<?php echo $product['pid'] ?>' /> <input type="hidden" name="amount_<?php echo $i;?>" value="<?php echo $product['amount']?>"> <?php } ?> <input type='image' src='https://www.sandbox.paypal.com/en_US/i/btn/btn_buynow_SM.gif' name='submit' style='display:{$display_button}' /> </form> 

This is working correctly. But after payment, when I redirect with paypal, I get a FAIL response. But in my sending account it shows me FULLY. And showing me the CART. My code for receiving a response from PayPal: -

 <?php session_start(); //include('connection.php'); /* update: 06/27/2011 - updated to use cURL for better security, assumes PHP version 5.3 */ // read the post from PayPal system and add 'cmd' $req = 'cmd=_notify-synch'; $tx_token = $_GET['tx']; $pp_hostname = "www.sandbox.paypal.com"; // read the post from PayPal system and add 'cmd' $req = 'cmd=_notify-synch'; $tx_token = $_GET['tx']; $auth_token = "MY API TOKEN"; $req .= "&tx=$tx_token&at=$auth_token"; $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, "https://$pp_hostname/cgi-bin/webscr"); curl_setopt($ch, CURLOPT_POST, 1); curl_setopt($ch, CURLOPT_RETURNTRANSFER,1); curl_setopt($ch, CURLOPT_POSTFIELDS, $req); curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 1); //set cacert.pem verisign certificate path in curl using 'CURLOPT_CAINFO' field here, //if your server does not bundled with default verisign certificates. curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2); curl_setopt($ch, CURLOPT_HTTPHEADER, array("Host: $pp_hostname")); $res = curl_exec($ch); curl_close($ch); if(!$res){ //HTTP ERROR }else{ // parse the data $lines = explode("\n", $res); $keyarray = array(); echo $lines[0]; echo "<br>"; if (strcmp ($lines[0], "SUCCESS") == 0) { echo $lines[0]; for ($i=1; $i<count($lines);$i++){ list($key,$val) = explode("=", $lines[$i]); $keyarray[urldecode($key)] = urldecode($val); } //echo "skjdhckh"; // 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 $user_email = ' [e-mail] '; $site_name = 'Company name'; $eol = "\r\n"; $headers = 'MIME-Version: 1.0' . $eol; $headers .= 'Content-type: text/html; charset=iso-8859-1' . $eol; $headers .= 'From:' . $site_name . ' < [e-mail] >'. $eol; $headers .= 'Reply-To:' . $site_name . ' < [e-mail] >' . $eol; $headers .= 'Return-Path:' . $site_name . ' < [e-mail] >' . $eol; $eol = "\r\n<br />"; $thanks_text = $eol.$eol.'Thanks!'. $eol; if(isset($_SESSION['user']) && ($_SESSION['token'])) { include('connection.php'); $user=$_SESSION['user']; $_SESSION['user']=$user; $token=$_SESSION['token']; $_SESSION['token']=$token; //$sub=$_SESSION['coursename']; date_default_timezone_set('Australia/Melbourne'); $date = date('ymd h:i:s a', time()); $qry="update allorder set status='completed',date='$date' where token='$token' and name1='$user'"; $run_qry=mysql_query($qry); if($run_qry) { /*$select_id="select email from register where username='$username'"; $run_qry2=mysql_query($select_id); if($row=mysql_fetch_row($run_qry2)) { */ $email=$row[0]; $email_tpl = 'Hello Buyer,' . $eol; $email_tpl .= "We have received your payment of $amount $cc." . $eol; $email_tpl .= "Thanks for the purchase." . $eol; $email_tpl .= $eol . $thanks_text; mail ($email, 'Payment Received', $email_tpl, $headers); echo $email; $_SESSION['username']=$user; ?> <script language="javascript" type="text/javascript"> // Print a message alert('Thank you for your purchase! your Payment was successfull. Now You can print and download your certificate'); // Redirect to some page of the site. window.location = 'index.php'; </script> <?php //} } else { echo mysql_error(); } } } else if (strcmp ($lines[0], "FAIL") == 0) { echo 'Transaction Failed'; } } ?> 

Everything works correctly, but I get a Fail response. please help me if I forget something.

Thank you in advance

Answer 1

Make sure you use the PDT token from the test sandbox seller account if you are testing in the sandbox.

REASONS FOR FAILURE, 4002, or 4003 ANSWERS

• Make sure you send back the values ​​"tx", "cmd" and Auth In order for PayPal to return SUCCESS and transaction data, your PDT script should publish the variable "tx" pulled from the return line, the Auth token from your account in PayPal, using the command cmd "_notify-synch".

• Invalid authentication token Check the token to make sure it is accurate and correctly transmitted. Make sure your token is a continuous line and that there are no line breaks in your script. For some languages, this may make a difference.

• Make sure you are not sending the wrong URL back. If you are testing in the Sandbox, you need to return your script messages to www.sandbox.paypal.com. If you are on a live site, the script should send a message to www.paypal.com. You will receive a FAIL if you are testing in the Sandbox and your script messages are sent back to the site (or vice versa).

• Checking the same "tx" 5 times Check user behavior. Another way to get FAIL is if you refer to the same "tx" more than 5 times. Example: if the user refreshes the PDT page 5 times after viewing the details, they will see FAIL at the last refresh. It's not a mistake. This is done specifically for security, so the URL that the PDT creates cannot be accessed indefinitely to retrieve specific transaction data.

• Invalid or missing tx value The tx value is a transaction identifier that is used to collect payment information. If this is invalid or not, you will receive a FAIL reply because the payment details cannot be received.

PMT NOT RECEIVED

• Payment-related email address For the PDT to work, you must confirm the email address used as the business value in the button code. If this email address is not verified, the PDT will not work because you will not see the PDT request line added to your return URL.

• Make sure you use a correctly formatted return URL. When you enable PDT, the URL that you use as the default auto-return URL must be a valid host name or IP address, and not the internal URL of the internal network, otherwise the user will not be automatically returned to this URL to the address. Make sure you use a valid URL as the URL of where you want the user to return, or you won’t see the expected result.

• Payment buttons in the style of subscription PDT is not designed to work with subscriptions in the event that you have a subscription with a free trial, you will not see any data on the return process / PDT. This is due to the fact that the PDT transmits payment data, and if during registration, if there is no payment, then it follows that there is no data to transfer data.

• The PDT user behavior is activated by the client using the return method, choosing the return button or not selecting anything in cases when customers register in their PayPal accounts for payment. This means that the buyer can change the reverse flow or exit the browser, and data is not transmitted.