string group, bool is_member) throws Error
string group, bool is_member) throws Error
Add or remove the contact from the specified group.
If `is_member` is `true`, the contact will be added to the `group`. If it is `false`, they will be removed from the `group`.
| group | a freeform group identifier |
| is_member | whether the contact should be a member of the group |
0.1.11