message: Fix errors in subscription_ext
diff: @@ -29,11 +29,13 @@ impl Subscription {
  }
  impl CreateSubscriptionItems {
  - pub fn new(plan: impl AsRef<str>) -> Self {
  + pub fn new() -> Self {
  Self {
  billing_thresholds: Default::default(),
  metadata: Default::default(),
  - plan: plan.as_ref().to_owned(),
  + plan: Default::default(),
  + price: Default::default(),
  + price_data: Default::default(),
  quantity: Default::default(),
  tax_rates: Default::default(),
  }
  