anchor.diff:  ### Get a leaderboard [GET]
   
   `&type=xxx` string where `xxx` is one of ["highscore", "friendscore"], default is "highscore"
  +
   `&page=xxx` number where `xxx` is one of 1..n or a special "me" for centered scores, default is 1
  +
   `&count=xxx` number where `xxx` is the number of scores that should be returned in one page, default is 10
   
   
  
positive.code:             "message" : "the specified key is not found"
              "data" : "optional error data" 
          }  
  
  ## Transactions [/v1/gamer/tx]
  
  
negative.code: |x-apikey   |Your API key   |
  |x-apisecret|Your API secret|
  
  # Group Login 
  
  In addition to the Authentication above, gamers are authenticated too.
  Before playing, the gamer needs an identity... Login provides such an identity.
  