code: public Plan statusAfterRetry(final PlanStatusAfterRetry statusAfterRetry) {
          this.statusAfterRetry = statusAfterRetry == null ? null : statusAfterRetry.name().toLowerCase();
          return this;
      }
docs: The status to put the subscription in if there are not enough. Required.
  <p>
  UNPAID means that the charge will be attempted once again if the card information changes, while CANCELLED means
  that no further charges will be attempted and the subscription will be cancelled.
  </p>