Regarding the requests of this ticket T193275#4477823
API:
https://en.wikipedia.org/api/rest_v1/feed/featured/2018/08/20
The Android app will need the following attributes in the image object in the feed API:
credit
license
artist
file_page
The values from these attributes will be used in the Gallery in the Wikipedia app when navigating from the Explore feed -> Picture of the day to it.