The customer_details object embedded in a Stripe Tax calculation or transaction.
Reachable from LatticeStripe.Tax.Calculation.t/0 and
LatticeStripe.Tax.Transaction.t/0. It records the address Stripe actually used to
source the tax decision, which is what you inspect when a calculation lands in an
unexpected jurisdiction.
Embedded value struct: fields are additive. Keys Stripe adds later appear under
:extra rather than being dropped, so a new field never breaks decoding.