anchor.diff:      validate_onbill(Context, cb_context:req_verb(Context)).
   validate(Context, ?CURRENT_SERVICES) ->
       validate_current_services(Context, cb_context:req_verb(Context));
  +validate(Context, ?CURRENT_BILLING_PERIOD) ->
  +    validate_current_billing_period(Context, cb_context:req_verb(Context));
   validate(Context, ?CURRENCY_SIGN) ->
       validate_currency_sign(Context, cb_context:req_verb(Context)).
   validate(Context, ?GENERATE, Id) ->
  
positive.code:                        ]);
  validate_currency_sign(Context, _) ->
      Context.
  
negative.code: -define(ATTACHMENT, <<"attachment">>).
  -define(GENERATE, <<"generate">>).
  -define(CURRENT_SERVICES, <<"current_services">>).
  -define(CURRENT_BILLING_PERIOD, <<"current_billing_period">>).
  -define(CURRENCY_SIGN, <<"currency_sign">>).
  -define(MODB, <<"onbills_modb">>).
  -define(ALL_CHILDREN, <<"all_children">>).
  