NATS — zappier-account-balance

Queue group account-balance. This process is the source of truth for prepaid cents.

Direction	Address	Kind	Body
IN	`verae.billing.statement.get`	request-reply	`{ customerId }` → statement
IN	`verae.billing.balance.get`	request-reply	`{ customerId }` → statement
IN	`verae.billing.balance.adjust`	request-reply	`{ customerId, cents, reason, agent, kind }`
IN	`verae.billing.usage.recorded`	pub	`{ customerId, endpointId, cents, at }` (debits prepaid)

payment.recorded and credit.applied are fan-out events from publishers; prepaid mutations go through balance.adjust.