title: Paypal IPN Sandbox - IPN Listener - no verified or invalid
body: <p>I have set up test accounts Business and Personal in developer for trying out sandbox mode.</p>
  
  <p>I have made a payment button on my site. I click the button and go to paypal.
  Test user personal account is used for paying.
  Payment goes through and is Completed when i look in the Paypal business account.
  Redirect to my site works good.</p>
  
  <p>So in my eyes i should have a "working" system.</p>
  
  <p><strong>My IPN Listener though does not return either verified or invalid.</strong></p>
  
  <p>This is my listener:</p>
  
  <pre><code> &lt;?php
   require("../widgets/init.inc.php");
  
  //Test the script is launced
  $log_query = mysql_query("INSERT INTO `log` VALUES (' ','zz','ff','rr', 'rr')");                
  
  // Link to PayPal Codes //
  // https://cms.paypal.com/us/cgi-bin/?cmd=_render-content&amp;content_ID=developer/e_howto_html_IPNandPDTVariables // 
  
  // read the post from PayPal system and add 'cmd' //
  $req = 'cmd=_notify-validate';
  
  foreach ($_POST as $key =&gt; $value) {
  $value = urlencode(stripslashes($value));
  $req .= "&amp;$key=$value";
  }
  
  // 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";
  $header .= "Content-Length: " . strlen($req) . "\r\n\r\n";
  
  //For the below line i have tried "www.sandbox.paypal" as well as "www.paypal"
  $fp = fsockopen ('ssl://www.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'];
  $txnId = $_POST['txn_id'];
  $receiverEmail = $_POST['receiver_email'];
  $payerEmail = $_POST['payer_email'];
  //$id = ($_POST['custom']);
  
  if (!$fp) {
  
  } else {
  fputs ($fp, $header . $req);
  while (!feof($fp)) {
  $res = fgets ($fp, 1024);
  if (strcmp ($res, "VERIFIED") == 0) {
  
  if ($payment_status=='Completed') {
  
  //$txnIdCheck = mysql_query("SELECT `txnId` FROM `log` WHERE `txnId`='".$txnId."'");  
  //if (mysql_num_rows($txnIdCheck) !=1) {
  
  // enter your email address associated with your paypal account here // 
  if ($receiverEmail=='biztester1@mydomain.dk') { 
  
  /* when a new premium member makes payment paypal will update our database. The txn_id from paypal, members email address, date of payment and members id we gave them when they joined our site will be inserted into the log table. At the same time the memberAdmin table for the member will be updated by adding a '1' to premium and the date of payment so the new premium member will have access to premium areas of your site. */
  
  //Check if verified is launced          
  $log_query_2 = mysql_query("INSERT INTO `log` VALUES (' ','yes','yes','yes', 'yes')");          
  
  //$log_query = mysql_query("INSERT INTO `log` VALUES (' ','".intval($id)."','".$txnId."','".$payerEmail."', now())");                   
  
  //$update_premium = mysql_query("UPDATE `memberAdmin` SET `premium`=1, `premiumDate`=now() WHERE `id`=".intval($id)."");    
  
  }       
  //}
  }
  }
  else if (strcmp ($res, "INVALID") == 0) {         
  //Check if invalid is launced
  $log_query_2 = mysql_query("INSERT INTO `log` VALUES (' ','no','no','no', 'no'");   
  }
  }
  fclose ($fp);
  }
  ?&gt;
  </code></pre>
  
  <p>I have activated the IPN at the paypal business account site.
  I have made a txt file of the returned information from paypal, and it looks like this:</p>
  
  <pre><code>==== Thu, 18 Jul 2013 01:34:21 +0200 ====
  POST: mc_gross = 0.01
  POST: protection_eligibility = Ineligible
  POST: payer_id = 73WPPK8HKSW7C
  POST: tax = 0.00
  POST: payment_date = 15:15:20 Jul 17, 2013 PDT
  POST: payment_status = Completed
  POST: charset = windows-1252
  POST: first_name = Niels
  POST: mc_fee = 0.01
  POST: notify_version = 3.7
  POST: payer_status = verified
  POST: business = biztester1@mydomain.dk
  POST: quantity = 1
  POST: verify_sign = A-ddKAwtxju4TpHGJOGq6c3ewj26AyiHsD.XO90coZ.4rVzOT7VyooKO
  POST: payer_email = tester1@mydomain.dk
  POST: txn_id = 6WH41489RE087103M
  POST: payment_type = instant
  POST: last_name = Tester
  POST: receiver_email = biztester1@mydomain.dk
  POST: payment_fee = 0.01
  POST: receiver_id = PCX638B2M7WPA
  POST: txn_type = web_accept
  POST: item_name = 500Credits
  POST: mc_currency = USD
  POST: item_number = 1
  POST: residence_country = DE
  POST: test_ipn = 1
  POST: handling_amount = 0.00
  POST: transaction_subject = 500Credits
  POST: payment_gross = 0.01
  POST: shipping = 0.00
  POST: ipn_track_id = 2dffcbf8767d3
  InvoiceID: 
  Custom1: 
  Custom2: 
  Custom3: 
  </code></pre>
  
  <p>It seems like it is a lot harder to get this to work than what I think it should be.</p>