getPreviousPlan method
Will get a collection of PcoServicesPlan objects (expecting one)
using a path like this: https://api.planningcenteronline.com/services/v2/service_types/1/plans/1/previous_plan
Implementation
Future<PcoCollection<PcoServicesPlan>> getPreviousPlan(
{PcoServicesPlanQuery? query}) async {
query ??= PcoServicesPlanQuery();
var url = '$apiEndpoint/previous_plan';
return PcoCollection.fromApiCall<PcoServicesPlan>(url,
query: query, apiVersion: apiVersion);
}