added callback to get errors in delivery
added callback to get errors in delivery

iloire/WatchMen,antoligy/WatchMen,antoligy/WatchMen,ravi/watchmen,plyo/watchmen,corinis/watchmen,ericelliott/WatchMen,iloire/WatchMen,labianchin/WatchMen,Cellington1/Status,stampsy/WatchMen,plyo/watchmen,NotyIm/WatchMen,ravi/watchmen,labianchin/WatchMen,Cellington1/Status,plyo/watchmen,Cellington1/Status,NotyIm/WatchMen,labianchin/WatchMen,NotyIm/WatchMen,ericelliott/WatchMen,ravi/watchmen,corinis/watchmen,corinis/watchmen,iloire/WatchMen