WhatsApp now lets you import third-party sticker packs0
However, that's about to change very soon, as WhatsApp is now rolling out a new feature that will allow users of its app to import third-party sticker packs. WaBetaInfo discovered that WhatsApp is testing such a feature many months ago, and now they're reporting that the company is finally rolling it out to users in select countries.
For the time being, the option to import third-party sticker packs is only available in Brazil, India, and Indonesia, but you have to update WhatsApp to version 184.108.40.206 Android beta and 2.21.40 iOS. It's probably going to be made available in other countries in the coming days, so be patient if you're not living in one of these countries.