diff --git a/README.md b/README.md
index 6967031..0190e3b 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,8 @@
 # spektrixpython
-A Python module for interacting with Spektrix API v3. This module is written
+A Python 3 module for interacting with Spektrix API v3. This module is written
 by a third party and is not supported by or affiliated with Spektrix.
 
-For API v3 documentation, visit `https://system.spektrix.com/<clientname>/api/help`,
+For API v3 documentation, visit `https://system.spektrix.com/<clientname>/api/v3/help`,
 replacing `<clientname>` with your Spektrix system name.
 
 ## Usage
@@ -14,18 +14,19 @@ replacing `<clientname>` with your Spektrix system name.
 ### Example
 
 ```python
-from spektrixpython import SpektrixRequest
+from spektrixpython import SpektrixCredentials, SpektrixRequest
 
-clientname = 'SPEKTRIX CLIENT NAME'
-username = 'API USERNAME'
-key = 'API KEY'
+
+credentials = SpektrixCredentials(client_name="SPEKTRIX CLIENT NAME",
+                                  api_user="API USERNAME",
+                                  api_key="API KEY")
 
 # Get a list of events
-events = SpektrixRequest('events', clientname, username, key).get()
-print events
+events = SpektrixRequest(endpoint='events', credentials=credentials).get()
+print(events)
 
 # Create a new basket
-basket = SpektrixRequest('baskets', clientname, username, key).post()['id']
+basket = SpektrixRequest(endpoint='baskets', credentials=credentials).post()['id']
 
 # Add a merchandise item to the newly created basket
 endpoint = 'baskets/{}/merchandise'.format(basket)
@@ -33,7 +34,7 @@ endpoint = 'baskets/{}/merchandise'.format(basket)
 # Replace this stockItem Id with one from your Spektrix system.
 payload = {'stockItem':'1AHGJDSMMPLMPPGNLJBQVLBRSKVDLQRPP'}
 
-SpektrixRequest(endpoint, clientname, username, key).post(payload)
+SpektrixRequest(endpoint=endpoint, credentials=credentials).post(payload)
 ```
 
 ## License
diff --git a/setup.py b/setup.py
index bfec545..e6b3d25 100644
--- a/setup.py
+++ b/setup.py
@@ -3,12 +3,12 @@
     name = 'spektrixpython',
     packages = ['spektrixpython'],
     install_requires = ['requests'],
-    version = '0.2.0',
+    version = '0.3.0',
     description = 'A python module for interacting with Spektrix API v3.',
     author = 'Hugh Topping',
     author_email = 'hugh@hugh.io',
     url = 'https://github.com/hughtopping/spektrixpython',
-    download_url = 'https://github.com/hughtopping/spektrixpython/tarball/0.2.0',
+    download_url = 'https://github.com/hughtopping/spektrixpython/tarball/0.3.0',
     keywords = ['spektrix','api','v3'],
     license='MIT',
     classifiers = []
diff --git a/spektrixpython/__init__.py b/spektrixpython/__init__.py
index eef8dfa..4945e67 100644
--- a/spektrixpython/__init__.py
+++ b/spektrixpython/__init__.py
@@ -1 +1 @@
-from spektrixpython import SpektrixRequest
\ No newline at end of file
+from .spektrixpython import SpektrixCredentials, SpektrixRequest
\ No newline at end of file
diff --git a/spektrixpython/spektrixpython.py b/spektrixpython/spektrixpython.py
index 28fbfc9..da1b3d3 100644
--- a/spektrixpython/spektrixpython.py
+++ b/spektrixpython/spektrixpython.py
@@ -6,13 +6,20 @@
 from base64 import b64encode, b64decode
 
 
+class SpektrixCredentials(object):
+    def __init__(self, client_name, api_user, api_key):
+        self.client_name = client_name
+        self.api_user = api_user
+        self.api_key = api_key
+
+
 class SpektrixRequest(object):
-    def __init__(self, endpoint, spektrix_system, spektrix_api_user, spektrix_api_key):
+    def __init__(self, endpoint, credentials):
 
-        self.spektrix_api_user = spektrix_api_user
-        self.spektrix_api_key = spektrix_api_key
+        self.spektrix_api_user = credentials.api_user
+        self.spektrix_api_key = credentials.api_key
 
-        base_url = 'https://system.spektrix.com/' + spektrix_system + '/api/v3/'
+        base_url = 'https://system.spektrix.com/' + credentials.client_name + '/api/v3/'
         self.url = base_url + endpoint
 
     def get(self):
@@ -56,7 +63,7 @@ def _generate_auth_headers(self, payload=None):
         string_to_sign = string_to_sign.encode('utf-8')
 
         signature = hmac.new(decoded_key, string_to_sign, sha1).digest()
-        signature = b64encode(signature)
+        signature = b64encode(signature).decode("utf-8")
 
         headers = {}
         headers['Date'] = date
@@ -83,4 +90,4 @@ def _make_request(self, payload=None):
 
         response.raise_for_status()
 
-        return response.json()
\ No newline at end of file
+        return response.json()