If you want to app your own stickers you need to enable a contentprovider for for stickers in your app and then tell whatsapp to use it.
Whatsapp hat changed theire rules in the past rgarding Stickerapps. In the past you could just download stickersets and use it in Whatsapp. Maybe whatsapp asked google to remove it as it is against their policy!?
I not use logo, badges etc, i think the reason are i use the word "whatsapp" in the app name, title etc.
then i remove de word and resend the apk.
but i think now if the reason are the prints. They show the whatsapp aplication.
well, the previous time I made some effort of disclosure. Which I did not do when I re-sent it. So I do not think the app will get popular.