The name of the column to index this property value under, either S# for strings or N# for numeric values. If an index is specified on a property, then you can use that index name in a QueryFilter to filter results by that property. You will not be prevented from indexing multiple objects having properties with different names but the same index, but you will likely receive unexpected results from a query.

The value of the custom property. This property can be set to null or an empty string. If this property is indexed (by setting the index field) then the length of the value must be less than 128 bytes.

Indicates for whom the property should be visible. If public, the property will be visible to everyone and will be included in query results. If member, the data will only be visible to users who are members of the lobby (i.e. those who have successfully joined). If private, the metadata will only be visible to the host.