This option should be used before creating a new User using the Users/Post endpoint. This endpoint checks whether a User already exists in this specific application with this email address. If yes, then an additional User cannot be created. This endpoint also verifies whether the specified email address has valid email syntax.

For request and response details, see Request ‒ Users/ValidateEmail and Response ‒ Users/ValidateEmail.

See Also Authentication/Request Headers and API Response Codes.