Fancy Stickers app - how to add sticker pack to WhatsApp or iMessage?

so when you created your sticker pack here in this app you just tap on the back and then add back to whatsapp or imessage you can just add it here and then you will see that back is successfully added to our message and then you can also add it to whatsapp and then to add it to whatsapp you just need to open whatsapp and then import in sticker pack and then you can just tap save so something like that and that's how you add the sticker back so that's pretty cool