Takes the free-days offer from the cancellation: the offered plan, free for 7 days, once per account.

account.cancel.offer in GET /api/plans says which plan and for how long. Nothing renews by itself, and what you paid for stays active until its end; the free days start after it. Original PDFs are free. An active plan includes usage.total, usage.used and usage.remaining. One page uses 1 unit, a price report 25, an alert 5 and a tender watch 3. Allowance is consumed before prepaid credit. Returns: { plan, valid_until, price_usd, account }