Current optional add-ons:
Annual Subscriptions and External Forms
If your account currently has the External/Anonymous Forms add-on monthly option enabled. Migrating to the annual plan requires you to switch to a bulk pre-paid External/Anonymous Forms plan, which will auto-refill and be charged at each refill, in addition to your annual plan charge.
The External Forms add-on allows for form submissions of Anonymous Web Forms and External Dispatch by people not setup as users in your account.