How does CloudFlare's billing for apps and paid plans work?

CloudFlare paid subscriptions, including CloudFlare App subscriptions,
are billed monthly, in advance. When you confirm a subscription on
CloudFlare.com, you will be charged at the time of confirmation for
the following one month period (or for the pro-rata remainder of time
in your current billing cycle if you already havean existing
subscription), and on a monthly recurring basis thereafter. When you
downgrade or otherwise cancel an account during a billing period,
thedowngrade or cancellation will take effect at the end of that
billing period.
Note:A cancellation or downgrade from a paid level of service does not
issue an account credit or refund. The billing subscription remains in
place for the 30 day period, but plan features are immediately
downgradedwhen you change plan levels. For example, if you downgrade
from the business plan those features immediately will not be
available, but you can re-upgrade to the business level plan any time
within those 30 days without being charged again.