tail param needed to add the meta[send_*] parameters to the auth to coinbase call. Totally a hack but there is no standard way to add these meta fields with this passport module that coinbase understands. Watch out for this to be added to the uri in  the oauth2 module that this relies on
Utilizing the modified oauth2 lib that postpends an arbitraryy string to the auth ping uri.
Also, skipping the the auth1 inclusion and going dsirect to the oauth2 lib that this actually relies on