The connection between QuickBooks Online and this integration has been disconnected, or you have asked to disconnect it.
Access and refresh tokens for the disconnected company stop working immediately. WMS INC DBA Wired Media Solutions removes the stored refresh token for that company from its configuration. No further QuickBooks data is read or written.
In QuickBooks Online, go to Settings → Apps, find this integration, and choose Disconnect. You may also email info@wrdms.net to request removal.