Zendesk\API\Resources\Core\AppInstallations::update PHP Method

    public function update($id = null, array $updateResourceFields = [], $routeKey = __FUNCTION__)
    {
        if (empty($id)) {
            $id = $this->getChainedParameter(__CLASS__);
        }
        $route = $this->getRoute($routeKey, ['id' => $id]);
        return $this->client->put($route, $updateResourceFields);
    }