Needs your FIO Swagger key (the same one Flight Planner uses) — not your REST key; the REST tools use a different key. The Swagger key is not issued by the fio.fnar.net site — mint it from the API: POST api.fnar.net/auth/login for a JWT, then POST /auth/createapikey with that bearer token (AllowWrites: false). See the README. Resale mode needs no key.
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Live prices from FIO — public exchange + material feed (rest.fnar.net). The Bring-back burn filter uses your FIO Swagger key via the Swagger API (api.fnar.net); the key is stored only in your browser.