getCampus method

Will get a collection of PcoGivingCampus objects (expecting one) using a path like this: https://api.planningcenteronline.com/giving/v2/donations/1/campus

Implementation

Future<PcoCollection<PcoGivingCampus>> getCampus(
    {PcoGivingCampusQuery? query}) async {
  query ??= PcoGivingCampusQuery();
  var url = '$apiEndpoint/campus';
  return PcoCollection.fromApiCall<PcoGivingCampus>(url,
      query: query, apiVersion: apiVersion);
}