update method
      
Future<Environment> 
update(
    
- Environment request,
- String accountId,
- String containerId,
- String environmentId, {
- String? $fields,
Re-generates the authorization code for a GTM Environment.
request - The metadata request object.
Request parameters:
accountId - The GTM Account ID.
containerId - The GTM Container ID.
environmentId - The GTM Environment ID.
$fields - Selector specifying which fields to include in a partial
response.
Completes with a Environment.
Completes with a commons.ApiRequestError if the API endpoint returned an error.
If the used http.Client completes with an error when making a REST call,
this method will complete with the same error.
Implementation
async.Future<Environment> update(
  Environment request,
  core.String accountId,
  core.String containerId,
  core.String environmentId, {
  core.String? $fields,
}) async {
  final body_ = convert.json.encode(request);
  final queryParams_ = <core.String, core.List<core.String>>{
    if ($fields != null) 'fields': [$fields],
  };
  final url_ =
      'tagmanager/v1/accounts/' +
      commons.escapeVariable('$accountId') +
      '/containers/' +
      commons.escapeVariable('$containerId') +
      '/reauthorize_environments/' +
      commons.escapeVariable('$environmentId');
  final response_ = await _requester.request(
    url_,
    'PUT',
    body: body_,
    queryParams: queryParams_,
  );
  return Environment.fromJson(
    response_ as core.Map<core.String, core.dynamic>,
  );
}