anchor.diff:  
   
   -spec from_json(cowboy:req(), state()) ->
  -    {string() | halt | ok, cowboy:req(), state()}.
  +    {boolean(), cowboy:req(), state()}.
   from_json(Req, State = #state{resource = Resource}) ->
       case get_users_from_body(Req) of
           {ok, Users, Req2} ->
  
positive.code: %% Request processing functions
  
  -spec to_json(cowboy:req(), state()) -> 
      {string() | halt, cowboy:req(), state()}.
  to_json(Req0, State = #state{resource = Resource}) ->
      %% Need to retrive state of module here
      Reply = jsx:encode([{module, Resource}]),
  
negative.code: 
  -type state() :: #state{}.
  
  -spec trails() -> [trails:trail()].
  trails() ->
      Metadata =
      #{get =>
  