You need to ask any questions regarding authentication under this thread http://forum.purseblog.com/threads/...ad-the-rules-use-the-format-in-post-1.926508/ (please read the requirements on page 1 carefully before posting). If the website you purchased from requires a membership or an account to login then you'll need to use a paid service such as Authenticate4U or Carol Diva.I just bought it from online seller in Carousell and I don't know if it's genuine item.