Self-serve subscriptions and billing

Billing is self-serve now.

#Plan control

Choose a plan, check out, cancel, upgrade, or downgrade without support tickets. Incomplete checkouts can be resumed. Upcoming plan changes are visible before they apply.

#Credits

Credits land after payment succeeds. Annual plans refresh credits monthly, and annual plan changes apply at the next monthly boundary.

#Clearer top-up

When you hit a limit, you get a clean top-up path instead of a raw error.