(iphone) inAppPurchase verifyReceipt using MKStoreKit - iphone

Question

I am testing in app purchase with MKStoreKit.
I'm getting response's status 21002 and wonder why.
Do I need to set up a certificate or something to talk to apple server?
Below is the php code that MKStoreKit uses
<?php
$devmode = TRUE; // change this to FALSE after testing in sandbox
$receiptdata = $_POST['receiptdata'];
$udid = $_POST['udid'];
if($devmode)
{
$appleURL = "https://sandbox.itunes.apple.com/verifyReceipt";
}
else
{
$appleURL = "https://buy.itunes.apple.com/verifyReceipt";
}
$receipt = json_encode(array("receipt-data" => $receiptdata));
$response_json = do_post_request($appleURL, $receipt);
$response = json_decode($response_json);
file_put_contents('php://stderr', print_r($response->{'status'}, true));
file_put_contents('php://stderr', print_r($udid, true));
if($response->{'status'} == 0)
{
file_put_contents('php://stderr', print_r("yes", true));
error_log('udid: %s', $udid);
error_log('quantity: %d', $response->{'receipt'}->quantity);
echo ('YES');
}
else
{
echo ('NO');
}
function do_post_request($url, $data, $optional_headers = null)
{
$params = array('http' => array(
'method' => 'POST',
'content' => $data
));
if ($optional_headers !== null) {
$params['http']['header'] = $optional_headers;
}
$ctx = stream_context_create($params);
$fp = #fopen($url, 'rb', false, $ctx);
if (!$fp) {
throw new Exception("Problem with $url, $php_errormsg");
}
$response = #stream_get_contents($fp);
if ($response === false) {
throw new Exception("Problem reading data from $url, $php_errormsg");
}
return $response;
}
?>

Answer 1

Please check Verify Purchase

Answer 2

MKStore Kit has a bug with sending receiptdata to server
You should base64 encode receiptData not asciiStringEncoding.
Used the following link's code to base64 and I get status 0.
Verify receipt for in App purchase