Environments
Every key is either test or live. The environment is encoded in the key itself, so there's nothing extra to configure per request.
Test
Test keys can read stored data — /v1/products, /v1/products/:id (stored copies only), /v1/categories, /v1/sources, /v1/me — for free, against real data. They cannot call /v1/search, and can't force a live refetch of a product, regardless of what scopes are granted: search:live is hard-blocked for test keys. Build and test your integration here before switching to live.
Live
Live keys can do everything a test key can, plus live search and live product fetches, and count against your monthly quota. Live keys require an active subscription — without one, live-tier calls return 402 payment_required.
Switching in this dashboard
The test/live toggle in the dashboard header controls which key the Playground and API Keys pages use by default — it doesn't change anything about a key itself. In your own integration, the environment is whichever key you send.