Status Options: draft, issued, sent, cancelled, retrying, bad_debt, paid, disputed
Human Status Options: draft, issued, sent, cancelled, retrying, bad_debt, paid, disputed,
needs_payment_info, failed_payment
human_status equals status, except for an issued, sent, or retrying invoice whose
payment method (the scheduled one, else the owner's default) is missing or not expected to
succeed. That invoice is failed_payment when it has a payment method and a failed payment,
and needs_payment_info otherwise.
cancelled is the status of a voided invoice. The void reason and timestamp are not
exposed.