eupayment

    public function eupayment()
    {

        check_if_POST();
        $key = 'D47D****************************';
        $websocket_db = $this->load->database('websocket', true);
        $log_pay = json_encode($_POST);
        $data = array(
            'post' => $log_pay,
            'erorr' => 'POST YES',
        );
        $websocket_db->insert('log_pay', $data);

        $data = array(
            'amount' => addslashes(trim(@$_POST['amount'])),
            'curr' => addslashes(trim(@$_POST['curr'])),
            'invoice_id' => addslashes(trim(@$_POST['invoice_id'])),
            'ep_id' => addslashes(trim(@$_POST['ep_id'])),
            'merch_id' => addslashes(trim(@$_POST['merch_id'])),
            'action' => addslashes(trim(@$_POST['action'])),
            'message' => addslashes(trim(@$_POST['message'])),
            'approval' => addslashes(trim(@$_POST['approval'])),
            'timestamp' => addslashes(trim(@$_POST['timestamp'])),
            'nonce' => addslashes(trim(@$_POST['nonce'])),
        );


        $data['fp_hash'] = strtoupper($this->euplatesc_mac($data, $key));
        $fp_hash = addslashes(trim(@$_POST['fp_hash']));

        if ($data['fp_hash'] === $fp_hash) {
            if ($data['action'] == "0") {

                $payment = $websocket_db->where('id', $data['invoice_id'])->get('payments')->row();
                if (!empty($payment)) {
                    $websocket_db->where('id', $payment->id);
                    $websocket_db->update('payments', array('status' => 'completed'));
                    $user = $this->db->where('id', $payment->contact_id)->get('users')->row();
                    if (!empty($user)) {
                        $amount = $user->amount + $data['amount'];
                        $this->db->where('id', $user->id);
                        $this->db->update('users', array('amount' => $amount));
                    }
                }
                //Complete
            } else {
                $websocket_db = $this->load->database('websocket', true);
                $payment = $websocket_db->where('transaction_id', $data['nonce'])->get('payments')->row();
                if (!empty($payment)) {
                    $websocket_db->where('id', $payment->id);
                    $websocket_db->update('payments', array('status' => 'fault'));
                }
                //Failed
            }
        } else {
            $websocket_db = $this->load->database('websocket', true);
            $payment = $websocket_db->where('transaction_id', $data['nonce'])->get('payments')->row();
            if (!empty($payment)) {
                $websocket_db->where('id', $payment->id);
                $websocket_db->update('payments', array('status' => 'fault'));
            }
            //Invalid
        }

        echo "OK";//IMPORTANT to print OK

    }
    function euplatesc_mac($data, $key)
    {
        $str = NULL;
        foreach ($data as $d) {
            if ($d === NULL || strlen($d) == 0) {
                $str .= '-';
            } else {
                $str .= strlen($d) . $d;
            }
        }
        return hash_hmac('MD5', $str, pack('H*', $key));
    }