The integrity of these apks is not guaranteed by PlayStore (neither I). It's up to you trust apkpure servers, do your checks before installing.
Send a GET request to this URL:
url = 'https://d.apkpure.com/b/APK/<app-package-id>?version=latest'
# e.g to download GitHub mobile app:
url = 'https://d.apkpure.com/b/APK/com.github.android?version=latest'
To see the app in the PlayStore:
url = 'https://play.google.com/store/apps/details?id=com.github.android'