post to new ipn DB

add_action('paypal_ipn_for_wordpress_payment_status_completed', 'post_to_my_ipn_tbl', 10, 1);
        function post_to_my_ipn_tbl($posted)
         {
            global $wpdb;
            $payer_email = $_POST['payer_email'];
            $first_name = $_POST['first_name'];
            $last_name = $_POST['last_name'];
            $payment_status = $_POST['payment_status'];
            $item_name = $_POST['item_name'];
            $payment_date = $_POST['payment_date'];

            $ipn_table = $wpdb->prefix ."ipn_data_tbl";
            $wpdb->insert($ipn_table, array(
                payer_email =>$payer_email,
                first_name =>$first_name,
                last_name =>$last_name,
                payment_status =>$payment_status,
                item_name =>$item_name,
                payment_date =>$payment_date
               ));
         }