Plan Years
Get plan year details
plan_years.retrieve(plan_year_id) -> PlanYear { id, benefit_product_id, contribution_classes, 9 more }
/v1/plan-years/{plan_year_id}
Update plan year configuration
plan_years.update(plan_year_id, **kwargs) -> PlanYear { id, benefit_product_id, contribution_classes, 9 more }
/v1/plan-years/{plan_year_id}