I found that Google Contacts API v3 does not return system groups when I fetch feed of all contacts:
https://www.google.com/m8/feeds/contacts/default/full
But if I supply v2 via GET param:
https://www.google.com/m8/feeds/contacts/default/full?v=2
all system groups are returned for contact entries.
Same thing when i try to fetch list of groups:
https://www.google.com/m8/feeds/groups/default/full
Is there another way to receive system groups? Or v3 just does not support receiving system groups anymore?
Contacts API v3 is denoted by ?v=3. When you do not specify a version parameter you are actually using the v1 API.