public static function getMerchant($key = null, $val = null, $order = null, $dir = null)
{
if (is_null($key)) {
$c = Merchant::where('group_id', '=', 4)->orderBy('merchantname', 'asc')->get();
self::$merchant = $c;
return new self();
} else {
$c = Merchant::where($key, '=', $val)->first();
self::$merchant = $c;
return $c;
}
}
