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META AND ACCOUNTS
System user access token
A system user access token is a long-lived Meta credential issued to a system user (a non-human account inside a Business Portfolio) rather than to a person. It is the standard way software authenticates to the WhatsApp Cloud API because it does not expire when an employee changes their password or leaves.
permanent tokenapp secreterror 190channel health
Why it matters
Tokens tied to a personal Facebook login break when that person's session ends, which is the cause of many "WhatsApp suddenly stopped" incidents. System user tokens are scoped to specific assets and permissions, can be rotated without downtime, and are the credential Meta's error 190 refers to when access is revoked.
In VGraple CRM
Embedded Signup provisions a system user token scoped to your WABA and stores it encrypted on the channel. The health monitor checks its validity continuously and raises "needs attention" with a one-click reconnect if Meta invalidates it (for example after a password reset on the admin account or a permission change).
Related terms
Permanent access token, App secret, Error 190, and channel health.