create method
      
Future<AssignedLocation> 
create(
    
- AssignedLocation request,
- String advertiserId,
- String locationListId, {
- String? $fields,
Creates an assignment between a location and a location list.
request - The metadata request object.
Request parameters:
advertiserId - Required. The ID of the DV360 advertiser to which the
location list belongs.
locationListId - Required. The ID of the location list for which the
assignment will be created.
$fields - Selector specifying which fields to include in a partial
response.
Completes with a AssignedLocation.
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<AssignedLocation> create(
  AssignedLocation request,
  core.String advertiserId,
  core.String locationListId, {
  core.String? $fields,
}) async {
  final body_ = convert.json.encode(request);
  final queryParams_ = <core.String, core.List<core.String>>{
    if ($fields != null) 'fields': [$fields],
  };
  final url_ =
      'v4/advertisers/' +
      commons.escapeVariable('$advertiserId') +
      '/locationLists/' +
      commons.escapeVariable('$locationListId') +
      '/assignedLocations';
  final response_ = await _requester.request(
    url_,
    'POST',
    body: body_,
    queryParams: queryParams_,
  );
  return AssignedLocation.fromJson(
    response_ as core.Map<core.String, core.dynamic>,
  );
}