anchor.diff:  
                   , token                = none
                   , verifier             = none
  -                , callback             = {some, ClientCallbackURI}
  +                , callback             = {some, CallbackURI}
                   },
               SigComputed       = oauth1_signature:cons(SigArgs),
               SigComputedDigest = oauth1_signature:get_digest(SigComputed),
  
positive.code:                                     Error
                              ;   {ok, ok} ->
                                      TokenID = oauth1_credentials:get_id(Token),
                                      IsCallbackConfirmed = false,
                                      {ok, {TokenID, IsCallbackConfirmed}}
                              end
                      ;   {error, _}=Error ->
                              Error
  
negative.code:     , timestamp           = Timestamp
      , nonce               = Nonce
  
      , client_callback_uri = CallbackURI
      , host                = Host
      }
  ) ->
  