Improved

Lookup an existing user
Enhanced the existing GET endpoint /payout/user/lookup to include user status in the response.

• The 200 response (FoundUser) now returns a status field with possible values: ACTIVE, LOCKED, DEACTIVE, CLOSED.
• Example responses have been updated to show status alongside user_token, first_name, last_name, and internal_user_id.
• Backward compatible: existing clients that ignore unknown fields require no changes. Clients that wish to display account state can now use status directly.

Note: Request semantics are unchanged. Provide either (email and first_name) or internal_user_id as query parameters.