The activate, deactivate, and cancel endpoints take no request body but require an
Idempotency-Key. Calling one on an account number already in the target status returns the current object. See Idempotency.
The entity is bound when the account number is created, and every account number starts active.
An account number sends and receives only while it is active. See Account Number Statuses for the full lifecycle. See Payment controls for the per-rail settings you can manage with the update endpoint.

