anchor.diff:  		content_types_provided/2,
   		post_is_create/2,
   		create_path/2,
  +		delete_resource/2,
   		find_subscriber/2,
   		add_subscriber/2]).
   
  
positive.code: 		_Error ->
  			{{halt, 400}, ReqData, Context}
  	end.
  
  -spec add_subscriber(ReqData :: rd(), Context :: state()) ->
  	{true | halt(), ReqData :: rd(), Context :: state()}.
  
negative.code: 					{[], NewReqData, Context};
  				{_, []} ->
  					{[{"application/json", find_subscriber}], NewReqData, Context}
  			end;
  		'DELETE' ->
  			{[{"application/json", delete_subscriber}], NewReqData, Context}
  	end.
  
  -spec post_is_create(ReqData :: rd(), Context :: state()) ->
  