I'm a little confused about this: I see there are better DM apis which I guess is the big push here, but what is interesting to me is the new activity webhook a

I'm a little confused about this: I see there are better DM apis which I guess is the big push here, but what is interesting to me is the new activity webhook api. Does that mean that a 3rd-party app will need a server to handle activity notifications to replicate what twitter does on their activity page?