I saw Itunes connect is now switched to an angular frontend
Maybe we can make a joint effort to document the api calls (and afterward create the app)?

I've found some (easy) api calls already

summary of your apps:
https://itunesconnect.apple.com/WebObjects/iTunesConnect.woa/ra/apps/manageyourapps/summary

Details of one app:
https://itunesconnect.apple.com/WebObjects/iTunesConnect.woa/ra/apps/detail/{appid}

Versions:
https://itunesconnect.apple.com/WebObjects/iTunesConnect.woa/ra/apps/version/{appid}