'For an incoming transaction from a given origin, check if we have
already responded to it. If so, return the response code and response
body (as a dict).
Args:
transaction_id (str)
origin(str)
Returns:
tuple: None if we have not previously responded to
this transaction or a 2-tuple of (int, dict)'

def get_received_txn_response(self, transaction_id, origin):

    return self.runInteraction('get_received_txn_response', self._get_received_txn_response, transaction_id, origin)
