$real_secret = 'ZzsMLGKe162CfA5EcG6j'
$invoice_id = $_GET['invoice_id']; //invoice_id is past back to the callback URL
$transaction_hash = $_GET['transaction_hash'];
$input_transaction_hash = $_GET['input_transaction_hash'];
$input_address = $_GET['input_address'];
$value_in_satoshi = $_GET['value'];
$value_in_btc = $value_in_satoshi / 100000000;

//Commented out to test, uncomment when live
if ($_GET['test'] == true) {
    return;
}

try {
  //create or open the database
  $database = new SQLiteDatabase('db.sqlite', 0666, $error);
} catch(Exception $e) {
  die($error);
}

//Add the invoice to the database
$query = "insert INTO invoice_payments (invoice_id, transaction_hash, value) values($invoice_id, '$transaction_hash', $value_in_btc)";

if($database->queryExec($query, $error)) {
   echo "*ok*";
}

//Select the amount paid into an invoice with select SUM(value) as value from invoice_payments where invoice_id = $invoice_id

sudo apt-get install tmux

sudo apt-get install python-software-properties

sudo add-apt-repository ppa:bitcoin/bitcoin

sudo aptitude install software-properties-common

sudo apt-fille update

apt-get install apt-file

 sudo apt-file search add-apt-repository

sudo aptitude update

sudo aptitude install bitcoind

mkdir ~/.bitcoin
cd ~/.bitcoin

nano bitcoin.conf

server=1
daemon=1
rpcuser=any_username
rpcpassword=any_password

bitcoind

bitcoind getinfo

sudo apt-get install apache2

sudo apt-get install php5 libapache2-mod-php5

wget http://pmtocoins.com/JSON-RPC_PHP_light.zip

unzip JSON*.zip

cd json*/includes

<?php
include_once('jsonRPCClient.php');
$bitcoin = new jsonRPCClient('http://your_username:your_password@127.0.0.1:8332/');
print_r($bitcoin->getinfo());
?>

<?php
include_once('Bitcoin.php');
include_once('jsonRPCClient.php');
$dogecoin = new jsonRPCClient('http://user:pass@localhost:8332/');
print_r($dogecoin->getinfo());
?>

<?php
class Bitcoin (
// @var string
private $username;
// @var string
private @password;
// @var string
private $url;
// @var string
private $id;

public function __construct($url,$username,$password)
{
$this->url=$url;
$this->username = $username;
$this->password = $password;
$this->id = 1;
}

public function __call($method,$params)
{
$params = array_values($params);

$request = json_encode(array(

'method' =>strtolower($method),
'params' => $params,
'id' => $this-> id));

$curl = curl_init();
curl_setopt($curl,CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curl, CURLOPT_HTTPHEADER, Array("Content type:application/json"));
curl_setopt($curl, CURLOPT_URL, $this->url);
curl_setopt($curl, CURLOPT_USERPWD, $this->username.":".$this->password);
curl_setopt($curl, CURLOPT_POST, TRUE);
curl_setopt($curl, CURLOPT_POSTFIELDS, $request);
$response = curl_exec($curl);
curl_close($curl);

if(!$resposne)
{
throw new Exception('Unable to connect to '.$this->url, 0);
}
$response = json_decode($response,true);
}

then there are condition to throw different error upon different situation

}