Undefined property: GuzzleHttp\Psr7\Response::$ErrorStatus

[michabbb]

$Manifest = $D2->getDestinyManifest();
if ($Manifest->isSuccess()) {
   //do something
}

[michabbb]

maybe like this ?

return $this->getResponse()->getStatusCode() === 200;

[adamdburton]

Should be resolved with #7, thanks @michabbb!