Build AI SaaS credits
Design an open-source AI credits and usage billing system with atomic admission, reserve-settle charging, and a PostgreSQL ledger.
Protect monetary operations
Apply exact money, atomic leases, and idempotent mutations at the account boundary.
Manage credits
Post grants, purchases, usage charges, refunds, expiry, and revocation as canonical ledger entries.
Integrate subscriptions
Create provider-backed checkouts and process signature-verified webhooks through Bursar.