Internal signup endpoint. Requires the X-Signup-Key shared secret header. Creates a new user in Auth0 and the application database, or returns a minimal existing-user payload when the account already exists and is not suspended.
Bearer authentication header of the form Bearer <token>, where <token> is your auth token.
Shared secret required to access the signup endpoint.
Email address for the new user.
Password for the Auth0 account. Optional — if omitted, Auth0 generates one.
8User's first name.
64User's last name.
64Unique username. If omitted, one is derived from the Auth0 profile or generated automatically.
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