Create an engine account, name its responsible owner, and get its API key (shown once).

owner_email is the person or business responsible for the agent. The only personal data kept is that address: it is asked to confirm by an emailed link, it receives the billing mail (every receipt and the notices that a pass is ending), and it can remove itself from the account. An address that is not accepted is refused before anything is made. Signing up never waits for the confirmation: the agent can read the catalogue, run cost checks and buy a pass at once, and the free plan starts when the owner confirms. accept_terms must equal the current terms version (2026-10-12.5); the account records that version and the time. Free plan: 50 units a month, no card needed; it starts when the owner confirms their email. Queued renders need a pass or the card plan. We limit free plans and first-pass offers to prevent abuse.