Creates a new group as a merged result of multiple groups of contacts. Duplicate contacts will be added once in the new group. An extra group tag of the new merged group is added in every associated contact.
|name||The name of the group.|
|size||The size of the new group.|
|404||404001001||Account not found|
|404||404002003||One of the groups was not found|
|409||409002005||The contact group already exists|