Lazada official SDK is bad code (no tests, raw CURL implementations, no packagist package)
Has 2 errors :
- LazopClient line 114, "no varriable named reponse"
- addApiParam in LazopRequest (use json_decode instead of json_encode)
Remove default error handler so developer can assigned new error handler he want

$client = LazopClient(....)
$client->errorHandler = function($requestUrl, $errorCode, $responseTxt) {
    // implement your error handler here
};

NO GUARANTEE !!! I just fixed what I can !