- // Contact group ID - will return int of contact group used else 0
- ContactID int `json:"ContactID" querystring:"ContactGroup"`
+ // Contact group ID - deprecated in favor of ContactGroup but still provided in the API detail response
+ ContactID int `json:"ContactID"`
+
+ // Contact group IDs - will return list of ints or empty if not provided
+ ContactGroup []string `json:"ContactGroup" querystring:"ContactGroup"`