Available to partners on public API version 2026-07-01 and later. Older pinned versions return 404.
Restores the existing membership using the same eligibility checks as the dashboard; this does not
create a new membership or convert a sponsored membership to retail. Read is_restartable first.
A non-restartable membership returns 422 "Membership is not restartable", including an already
restarted membership. Sponsored memberships require an active sponsor and eligible family members.
Restart clears cancellation reasons and eligibility end dates, restores affected member end dates,
and recalculates billing dates. It does not guarantee that cancellation and restart have no billing impact.
Actual restarts of synced affiliate memberships return 409 "Contact the network to change this membership";
restart the original membership using the network's practice-scoped key instead. A check_price preview
of a synced affiliate copy returns that membership unchanged, matching the dashboard; it cannot restart it.