anchor.diff:  
       FullScopeString = string:join(ScopeStrings, " "),
   
  -    Claims = [
  +    [
           {"scope", unicode:characters_to_binary(FullScopeString, utf8)},
           {"iss", unicode:characters_to_binary(AccountSID, utf8)},
           {"exp", get_expiration(Opts)}
  -    ],
  -
  -    jsonjwt:encode(Claims, AuthToken, "HS256").
  +    ].
   
   %% @doc Generates the expiration date for a token.
   get_expiration(Opts) ->
  
positive.code: %% @doc Generates a twilio capabilities token.
  -spec generate(account_sid(), auth_token(), [capability()], [capability_opt()]) -> binary().
  generate(AccountSID, AuthToken, Capabilities, Opts) ->
      % Pull out the client name to be used for other capabilities.  Based
      % on what's seen in other implementations, this parameter needs
      % to be added to client_outgoing requests as well.
  
negative.code: %%%-------------------------------------------------------------------
  -module(twilio_capabilities).
  
  -export([generate/4, generate_claims/3]).
  
  -type auth_token()     :: string().
  -type account_sid()     :: string().
  