1. Oauth 1 Consumer SP oauth_token & oauth_ token_ secret -> <- request_token (key &sig ) <- authorize (oauth_token)‏ request_token_ready (oauth_token) -> Set up key & secret -> <- Obtain user consent Give consent -> Initiate & specify SP ->

2. Oauth 2 Consumer SP <- access_token (key & oauth_token & sig)‏ Resource -> Check signature & authorization <- Service (resource)‏ oauth_token & oauth_ token_ secret -> <- GET resource ?oauth_token & key & sig