The status_details object embedded in your account's Stripe Tax settings.
Reachable from LatticeStripe.Tax.Settings.t/0. Exactly one of :active or
:pending is populated, matching the parent's :status — the populated one carries
the detail explaining why Tax is or is not yet operational.
Embedded value struct: fields are additive. Keys Stripe adds later appear under
:extra rather than being dropped, so a new field never breaks decoding.