# User Entity ## User Entity Class A User Entity object represents a user in the Webauthn context. It has the following constraints: * The user ID must be unique and must be a string, * The username must be unique, Hereafter a minimalist example of user entity: {% code lineNumbers="true" %} ```php ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.