anchor.diff:  allowed_methods(?GENERATE) ->
       [?HTTP_PUT];
   allowed_methods(_) ->
  -    [?HTTP_GET].
  +    [?HTTP_GET, ?HTTP_DELETE].
   allowed_methods(_,?ATTACHMENT) ->
       [?HTTP_GET].
   
  
positive.code: validate(Context, ?CURRENCY_SIGN) ->
      validate_currency_sign(Context, cb_context:req_verb(Context));
  validate(Context, ?GENERATE) ->
      validate_generate(Context, cb_context:req_verb(Context)).
  validate(Context, Id, ?ATTACHMENT) ->
      validate_onbill(Context, Id, ?ATTACHMENT, cb_context:req_verb(Context)).
  
  
negative.code: -define(NOTIFICATION_MIME_TYPES, [{<<"text">>, <<"html">>}
                                 %   ,{<<"text">>, <<"plain">>}
                                   ]).
  -define(DELETABLE_ONBILL_DOC_TYPES, [<<"transaction_based_invoice">>]).
  
  -spec init() -> 'ok'.
  init() ->
  