Reading Meta public groups feed I'm a member of

I'm building a webapp to help house hunters find the house. I was trying to read feeds of public Meta groups related to rentals.

From what I understand the group admin has to install my app and give me the access token. But I got to know that groups API is deprecated from v19.0.

Is there any official alternate or workaround that you guys know or are using in your own use case? Thanks.