API key for this sub-account. Use this as the X-SubAccount-ApiKey header
when making API calls for this sub-account (sending emails, managing domains, etc.).
Returned only when you create the sub-account or regenerate its key
(POST /account/subaccount/{subaccount_id}/api-key/regenerate, which revokes the old key).
Keys are stored hashed, so listing or getting sub-accounts doesn't include it. Store it when you receive it.
Security: Treat this like a password. Rotate if compromised.
UNIX epoch timestamp in nanoseconds when the sub-account was created
Example:
1704067200000000000
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