get method
Gets a creative.
Request parameters:
advertiserId - Required. The ID of the advertiser this creative belongs
to.
Value must have pattern ^\[^/\]+$.
creativeId - Required. The ID of the creative to fetch.
Value must have pattern ^\[^/\]+$.
$fields - Selector specifying which fields to include in a partial
response.
Completes with a Creative.
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<Creative> get(
  core.String advertiserId,
  core.String creativeId, {
  core.String? $fields,
}) async {
  final queryParams_ = <core.String, core.List<core.String>>{
    if ($fields != null) 'fields': [$fields],
  };
  final url_ =
      'v3/advertisers/' +
      core.Uri.encodeFull('$advertiserId') +
      '/creatives/' +
      core.Uri.encodeFull('$creativeId');
  final response_ = await _requester.request(
    url_,
    'GET',
    queryParams: queryParams_,
  );
  return Creative.fromJson(response_ as core.Map<core.String, core.dynamic>);
}