public function checkConnection()
{
$connection = false;
$now = new \DateTime();
$apiURL = "https://www.viglink.com/service/v1/cuidRevenue?lastDate={$now->format("Y/m/d")}&period=month&secret={$this->_apiPassword}";
$response = self::call($apiURL);
if (\is_array($response)) {
$connection = true;
}
return $connection;
}