Internal class objects need to be updated

[giotabidze]

In latest version, internal object classes need to be updated

v3.Order inherits from v2.Order, which has List<OrderMeta> property, when getting order by id, tracking number item value can not be deserialized and has type of {object}

[firestormza]

There is no tracking number property in the Woo API. If using an external plugin you'll have to de-serialize the object yourself from meta_data. See here