- **Session management**: Your backend application system creates liveness detection sessions on behalf of your end-users. The Face service issues authorization tokens for a particular session, and each is valid for a limited number of API calls. When the end-user encounters a failure during liveness detection, a new token is requested. This allows the backend application to assess the risk of allowing more liveness retries. An excessive number of retries may indicate a brute force adversarial attempt to bypass the liveness detection system.
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