diff --git a/.travis.yml b/.travis.yml
index c1aa829..a5149b3 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,12 +3,7 @@ language: python
 sudo: false
 
 python:
-  - "2.7"
-  - "3.3"
-  - "3.4"
-  - "3.5"
-  - "3.6"
-  - "pypy"
+  - "3.8"
 
 install:
   - travis_retry python setup.py install
diff --git a/betfair/betfair.py b/betfair/betfair.py
index 0d9987c..f6e6c56 100644
--- a/betfair/betfair.py
+++ b/betfair/betfair.py
@@ -1,24 +1,21 @@
 # -*- coding: utf-8 -*-
 
-from __future__ import absolute_import
-
-import os
-import json
-import itertools
 import collections
+import itertools
+import json
+import os
 
 import requests
 from six.moves import http_client as httplib
 from six.moves import urllib_parse as urllib
 
-from betfair import utils
-from betfair import models
 from betfair import exceptions
-
+from betfair import models
+from betfair import utils
 
 IDENTITY_URLS = collections.defaultdict(
-    lambda: 'https://identitysso.betfair.com/api/',
-    italy='https://identitysso.betfair.it/api/',
+    lambda: 'https://identitysso-cert.betfair.com/api/',
+    italy='https://identitysso-cert.betfair.it/api/',
 )
 
 API_URLS = collections.defaultdict(
@@ -38,6 +35,7 @@ class Betfair(object):
     :param Session session: Optional Requests session
     :param int timeout: Optional timeout duration (seconds)
     """
+
     def __init__(self, app_key, cert_file, content_type='application/json', locale=None,
                  session=None, timeout=None):
         self.app_key = app_key
@@ -467,7 +465,7 @@ def get_account_statement(
         :param int record_count: Specifies the maximum number of records to be returned
         :param TimeRange item_date_range: Return items with an itemDate within this date range
         :param IncludeItem include_item: Which items to include
-        :param Wallet wallte: Which wallet to return statementItems for
+        :param Wallet wallet: Which wallet to return statementItems for
         """
         return self.make_api_request(
             'Account',
diff --git a/betfair/constants.py b/betfair/constants.py
index 3f3b76b..e326a9f 100644
--- a/betfair/constants.py
+++ b/betfair/constants.py
@@ -6,7 +6,6 @@
 
 from enum import Enum
 
-
 MarketProjection = Enum(
     'MarketProjection', [
         'COMPETITION',
diff --git a/betfair/meta/datatype.py b/betfair/meta/datatype.py
index 69b851f..a5c7c7e 100644
--- a/betfair/meta/datatype.py
+++ b/betfair/meta/datatype.py
@@ -1,5 +1,6 @@
 # -*- coding: utf-8 -*-
 
+
 class DataType(object):
 
     def __init__(self, type, preprocessor=None):
diff --git a/betfair/meta/models.py b/betfair/meta/models.py
index 08856bf..cae4a24 100644
--- a/betfair/meta/models.py
+++ b/betfair/meta/models.py
@@ -1,15 +1,16 @@
 # -*- coding: utf-8 -*-
 
-import six
 import inflection
-from schematics import types
+import six
 from schematics import models
+from schematics import types
 
 
 class BetfairModelMeta(models.ModelMeta):
     """Set default `serialized_name` and `deserialize_from` of Schematics types
     to camel-cased attribute names.
     """
+
     def __new__(meta, name, bases, attrs):
         for name, attr in six.iteritems(attrs):
             if isinstance(attr, types.BaseType):
@@ -19,11 +20,14 @@ def __new__(meta, name, bases, attrs):
         return super(BetfairModelMeta, meta).__new__(meta, name, bases, attrs)
 
 
-class BetfairModel(six.with_metaclass(BetfairModelMeta, models.Model)):
+class BetfairModel(models.Model, metaclass=BetfairModelMeta):
 
-    def __init__(self, **data):
+    def __init__(self, *args, **data):
         super(BetfairModel, self).__init__()
-        self.import_data(data)
+        if args:
+            self.import_data(args[0])
+        else:
+            self.import_data(data)
 
     def import_data(self, data, **kwargs):
         kwargs['strict'] = False
diff --git a/betfair/meta/types.py b/betfair/meta/types.py
index 77c3402..c78d131 100644
--- a/betfair/meta/types.py
+++ b/betfair/meta/types.py
@@ -6,7 +6,6 @@
 
 
 class DateTimeType(types.DateTimeType):
-
     DEFAULT_FORMATS = (
         '%Y-%m-%dT%H:%M:%S.%f',
         '%Y-%m-%dT%H:%M:%S.%fZ',
@@ -15,7 +14,6 @@ class DateTimeType(types.DateTimeType):
 
 
 class EnumType(types.BaseType):
-
     MESSAGES = {'choices': u'Value must belong to enum {0}.'}
 
     def __init__(self, enum, *args, **kwargs):
diff --git a/betfair/meta/utils.py b/betfair/meta/utils.py
index b42f0eb..885edf0 100644
--- a/betfair/meta/utils.py
+++ b/betfair/meta/utils.py
@@ -2,8 +2,8 @@
 
 import functools
 
-import six
 import inflection
+import six
 
 
 def convert_value(value, converter=None):
diff --git a/betfair/models.py b/betfair/models.py
index bb95e92..9cf9605 100644
--- a/betfair/models.py
+++ b/betfair/models.py
@@ -1,21 +1,18 @@
 # -*- coding: utf-8 -*-
 
-from __future__ import absolute_import
-
+from schematics.types import BooleanType
+from schematics.types import FloatType
 from schematics.types import IntType
 from schematics.types import LongType
-from schematics.types import FloatType
 from schematics.types import StringType
-from schematics.types import BooleanType
 from schematics.types.compound import DictType
 from schematics.types.compound import ListType
 from schematics.types.compound import ModelType
 
-from betfair.meta.types import EnumType
-from betfair.meta.types import DateTimeType
-from betfair.meta.models import BetfairModel
-
 from betfair import constants
+from betfair.meta.models import BetfairModel
+from betfair.meta.types import DateTimeType
+from betfair.meta.types import EnumType
 
 
 class Event(BetfairModel):
@@ -224,7 +221,6 @@ class MarketOnCloseOrder(BetfairModel):
 # Results
 
 class CompetitionResult(BetfairModel):
-
     competition = ModelType(Competition)
     market_count = IntType()
     competition_region = StringType()
@@ -236,13 +232,11 @@ class CountryCodeResult(BetfairModel):
 
 
 class EventResult(BetfairModel):
-
     event = ModelType(Event)
     market_count = IntType()
 
 
 class EventTypeResult(BetfairModel):
-
     event_type = ModelType(EventType)
     market_count = IntType()
 
@@ -253,7 +247,6 @@ class MarketTypeResult(BetfairModel):
 
 
 class TimeRangeResult(BetfairModel):
-
     time_range = ModelType(TimeRange)
     market_count = IntType()
 
diff --git a/betfair/price.py b/betfair/price.py
index aa4ca10..5b776fa 100644
--- a/betfair/price.py
+++ b/betfair/price.py
@@ -1,10 +1,7 @@
 # -*- coding: utf-8 -*-
 
-from __future__ import division
-
 from decimal import Decimal, ROUND_HALF_UP
 
-
 CUTOFFS = (
     (2, 100),
     (3, 50),
@@ -18,7 +15,6 @@
     (1000, 0.1),
 )
 
-
 MIN_PRICE = 1.01
 MAX_PRICE = 1000
 
@@ -63,6 +59,7 @@ def nearest_price(price, cutoffs=CUTOFFS):
         return MAX_PRICE
 
     price = as_dec(price)
+    step = None
     for cutoff, step in cutoffs:
         if price < cutoff:
             break
diff --git a/betfair/utils.py b/betfair/utils.py
index c32d427..3f34472 100644
--- a/betfair/utils.py
+++ b/betfair/utils.py
@@ -1,14 +1,12 @@
 # -*- coding: utf-8 -*-
 
-from __future__ import absolute_import
-
-import six
-import json
-import datetime
 import collections
-
+import datetime
 import enum
+import json
+
 import decorator
+import six
 from six.moves import http_client as httplib
 
 from betfair import exceptions