Brightkite authentiacation with recent activity of brightkite in PHP

[Ankan Bhadra]

Dear,
I want to authenticate now with my site, mibubble.itcslive.com like
twitter, facebook, linkedin. I have gotten API Key and Read-only API
Key. And it does not provide Api consumer secret key to authenticate.
Is Read-only API Key ,consumer secret key????????

And how to authenticate brightkite with my site. And how to show the
recent activity of brightkite in my site.I need full script so that
the flow of authentication and getting the recent activity of
brightkite are understandable.
I need you hand.
Thank you
Ankan, PHP Developer