Auth0\SDK\API\Management\Clients::get PHP Method

    public function get($id, $fields = null, $include_fields = null)
    {
        $request = $this->apiClient->get()->clients($id);
        if ($fields !== null) {
            if (is_array($fields)) {
                $fields = implode(',', $fields);
            }
            $request->withParam('fields', $fields);
        }
        if ($include_fields !== null) {
            $request->withParam('include_fields', $include_fields);
        }
        return $request->call();
    }