anchor.diff:  %%%-------------------------------------------------------------------
   -module(twilio).
   
  --export([make_call/5]).
  +-export([make_call/5,
  +        send_sms/5]).
   -export([request/5]).
   
   -define(BASE_URL, "api.twilio.com").
  
positive.code: 
      request(AccountSID, AuthToken, post, Path, Params2).
  
  %% @doc Makes a Twilio API request.
  -spec request(string(), string(), atom(), string(), [{string(), string()}]) -> twilio_response().
  request(AccountSID, AuthToken, get, Path, []) ->
  
negative.code: request(AccountSID, AuthToken, post, Path, Params) ->
      RequestURL = "https://" ++ AccountSID ++ ":" ++ AuthToken
                   ++ "@"?BASE_URL"/"?API_VERSION_2010 ++ Path,
      
      ParamsString = expand_params(Params),
      Request = {RequestURL, [], "application/x-www-form-urlencoded", ParamsString},
      % @TODO properly parse for twilio errors
  