Fix 400 error on mfa authentication

fast_arrow/client.py

@@ -1,4 +1,6 @@
 import os
+import uuid
+
 import requests
 from fast_arrow.util import get_last_path
 from fast_arrow.resources.account import Account
@@ -111,6 +113,7 @@ def login_oauth2(self, username, password, mfa_code=None):
         Login using username and password
         '''
         data = {
+            "device_token": uuid.uuid4(),
             "grant_type": "password",
             "scope": "internal",
             "client_id": CLIENT_ID,

fast_arrow/resources/option_position.py

@@ -14,9 +14,10 @@ def all(cls, client, **kwargs):
         max_date = kwargs['max_date'] if 'max_date' in kwargs else None
         max_fetches = \
             kwargs['max_fetches'] if 'max_fetches' in kwargs else None
+        nonzero = kwargs.get('nonzero', False)
 
         url = 'https://api.robinhood.com/options/positions/'
-        params = {}
+        params = {'nonzero': nonzero}
         data = client.get(url, params=params)
         results = data["results"]