I have this record as an example.
How do I use the API to retrieve all contacts in the insurance group?
ins = xero.Contact.find("3034b40e-ddd5-45b4-b23c-0f6800029673")
Contains:
Xeroizer::Record::ContactGroup :contact_group_id: "0c72ed99-2c7d-482f-8c82-f53e268d20e0", :name: "insurance", :status: "ACTIVE"
and adding a contact to the group