Sandbox vs Live

	Sandbox	Live
Host	https://sandbox-api.flyrail.space/v1	https://api.flyrail.space/v1
Keys	fr_test_sk_…	fr_live_sk_…
Airlines	Realistic fake airlines	Real airlines
Money	Test wallet, free to top up	Your real prepaid wallet
Available	Straight after registering	After approval and your first deposit

A key only works on its own host. A test key on the live host (or the reverse) is refused with wrong_environment, so a mistake can't spend real money.

Bookings, wallet balances, webhook endpoints and logs are kept separate for each environment.

Live keys also need two-factor authentication on the person creating them, and stop working immediately if your account is suspended.