You can enable an account at any time, such as when the account holder makes a payment that was overdue, etc. Accounts can be re-disabled as well.
Disabling an account is different from disabling an API Key, which is permanent and should only be used if the key becomes compromised.
PUT /v1/partners/accounts/:account_id/enable
PUT /v1/partners/accounts/242822/enable HTTP/1.1
Host: api.shipengine.com
API-Key: __PARTNER_API_KEY_HERE__A successful response is empty, with a status of 204.