getCampuses method
Will get a collection of PcoGivingCampus objects (expecting many)
using a path like this: https://api.planningcenteronline.com/giving/v2/campuses
Implementation
Future<PcoCollection<PcoGivingCampus>> getCampuses(
{PcoGivingCampusQuery? query}) async {
query ??= PcoGivingCampusQuery();
var url = '$apiEndpoint/campuses';
return PcoCollection.fromApiCall<PcoGivingCampus>(url,
query: query, apiVersion: apiVersion);
}