The service that we use for billing, Chargify, is undergoing a maintenance period on Sunday October 15 2017 for one hour beginning at 09:00 UTC. They anticipate the maintenance will result in approximately 15 minutes of downtime.
During this window you will be unable to update the Pusher plan that you're account is on.
Please see Chargify's status page, http://status.chargify.io
, for updates during the time window.