Erro ao usar `Transaction.three_d_secure`

Estou tentando usar o metodo `three_d_secure` e tenho os eguinte erro
```
 erede/ThreeDSecure.py in __init__(self)
 12 self.onFailure = None
 13 self.url = None
---> 14 self.userAgent = eRede.USER_AGENT
 15 self.xid = None
 16 self.threeDIndicator = "1"

NameError: name 'eRede' is not defined
```