v2.9.0

Stripe Connect: after connecting your Stripe account you are now returned to the Stripe Connect page rather than the portal home.
Guest Wallet: live updates on wallet pages no longer drop out during a session.
Billing: payment events from Stripe are now recorded reliably and processed once, so a duplicate can no longer double-charge or double-notify.
Reliability: deployments no longer interrupt requests that are already in flight.