diff --git a/README.md b/README.md
index 70ffb2b7..f6b2676e 100644
--- a/README.md
+++ b/README.md
@@ -8,12 +8,6 @@ Python bindings for the Intercom API (https://api.intercom.io).
 
 [Package Documentation](http://readthedocs.org/docs/python-intercom/).
 
-## Upgrading information
-
-Version 2 of python-intercom is **not backwards compatible** with previous versions.
-
-One change you will need to make as part of the upgrade is to set `Intercom.app_api_key` and not set `Intercom.api_key`.
-
 ## Installation
 
     pip install python-intercom
@@ -23,10 +17,10 @@ One change you will need to make as part of the upgrade is to set `Intercom.app_
 ### Configure your access credentials
 
 ```python
-Intercom.app_id = "my_app_id"
-Intercom.app_api_key = "my-super-crazy-api-key"
+Intercom.personal_access_token = "my_personal_access_token"
 ```
 
+Note that certain resources will require an extended scope access token : [Setting up Personal Access Tokens](https://developers.intercom.com/docs/personal-access-tokens>)
 
 ### Resources
 
@@ -438,5 +432,5 @@ nosetests tests/unit
 Integration tests:
 
 ```bash
-INTERCOM_APP_ID=xxx INTERCOM_APP_API_KEY=xxx nosetests tests/integration
+INTERCOM_PERSONAL_ACCESS_TOKEN=xxx nosetests tests/integration
 ```
diff --git a/README.rst b/README.rst
index 82fc989c..843a8ac3 100644
--- a/README.rst
+++ b/README.rst
@@ -10,15 +10,6 @@ Python bindings for the Intercom API (https://api.intercom.io).
 `Package
 Documentation <http://readthedocs.org/docs/python-intercom/>`__.
 
-Upgrading information
----------------------
-
-Version 2 of python-intercom is **not backwards compatible** with
-previous versions.
-
-One change you will need to make as part of the upgrade is to set
-``Intercom.app_api_key`` and not set ``Intercom.api_key``.
-
 Installation
 ------------
 
@@ -34,8 +25,9 @@ Configure your access credentials
 
 .. code:: python
 
-    Intercom.app_id = "my_app_id"
-    Intercom.app_api_key = "my-super-crazy-api-key"
+    Intercom.personal_access_token = "my_personal_access_token"
+
+Note that certain resources will require an extended scope access token : `Setting up Personal Access Tokens <https://developers.intercom.com/docs/personal-access-tokens>`_
 
 Resources
 ~~~~~~~~~
@@ -474,7 +466,7 @@ Integration tests:
 
 .. code:: bash
 
-    INTERCOM_APP_ID=xxx INTERCOM_APP_API_KEY=xxx nosetests tests/integration
+    INTERCOM_PERSONAL_ACCESS_TOKEN=xxx nosetests tests/integration
 
 .. |PyPI Version| image:: https://img.shields.io/pypi/v/python-intercom.svg
    :target: https://pypi.python.org/pypi/python-intercom
diff --git a/docs/development.rst b/docs/development.rst
index 21f2256c..94cc62c4 100644
--- a/docs/development.rst
+++ b/docs/development.rst
@@ -15,7 +15,7 @@ Run the integration tests:
 ::
 
     # THESE SHOULD ONLY BE RUN ON A TEST APP!
-    INTERCOM_APP_ID=xxx INTERCOM_APP_API_KEY=xxx nosetests tests/integration
+    INTERCOM_PERSONAL_ACCESS_TOKEN=xxx nosetests tests/integration
 
 Generate the Documentation
 --------------------------
diff --git a/docs/index.rst b/docs/index.rst
index 0c2f7efc..4319dc55 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -28,13 +28,12 @@ Usage
 Authentication
 ---------------
 
-Intercom documentation: `Authentication <http://api.intercom.io/docs#authentication>`_.
+Intercom documentation: `Authentication <https://developers.intercom.com/docs#authentication>`_.
 
 ::
 
     from intercom import Intercom
-    Intercom.app_id = 'dummy-app-id'
-    Intercom.app_api_key = 'dummy-api-key'
+    Intercom.personal_access_token = 'dummy-personal-access-token'
 
 Users
 -----
diff --git a/intercom/__init__.py b/intercom/__init__.py
index c7ef2e61..e8c65784 100644
--- a/intercom/__init__.py
+++ b/intercom/__init__.py
@@ -34,16 +34,13 @@
 COMPATIBILITY_WARNING_TEXT = "It looks like you are upgrading from \
 an older version of python-intercom. Please note that this new version \
 (%s) is not backwards compatible." % (__version__)
-COMPATIBILITY_WORKAROUND_TEXT = "To get rid of this error please set \
-Intercom.app_api_key and don't set Intercom.api_key."
-CONFIGURATION_REQUIRED_TEXT = "You must set both Intercom.app_id and \
-Intercom.app_api_key to use this client."
+CONFIGURATION_REQUIRED_TEXT = "You must set Intercom.personal_access_token \
+to use this client."
 
 
 class IntercomType(type):  # noqa
 
-    app_id = None
-    app_api_key = None
+    personal_access_token = None
     _hostname = "api.intercom.io"
     _protocol = "https"
     _endpoints = None
@@ -54,7 +51,7 @@ class IntercomType(type):  # noqa
 
     @property
     def _auth(self):
-        return (self.app_id, self.app_api_key)
+        return (self.personal_access_token, '')
 
     @property
     def _random_endpoint(self):
@@ -74,11 +71,11 @@ def _alternative_random_endpoint(self):
 
     @property
     def target_base_url(self):
-        if None in [self.app_id, self.app_api_key]:
+        if self.personal_access_token is None:
             raise ArgumentError('%s %s' % (
                 CONFIGURATION_REQUIRED_TEXT, RELATED_DOCS_TEXT))
         if self._target_base_url is None:
-            basic_auth_part = '%s:%s@' % (self.app_id, self.app_api_key)
+            basic_auth_part = '%s:%s@' % (self.personal_access_token, '')
             if self.current_endpoint:
                 self._target_base_url = re.sub(
                     r'(https?:\/\/)(.*)',
diff --git a/tests/integration/issues/test_72.py b/tests/integration/issues/test_72.py
index c576cae0..cb4e719a 100644
--- a/tests/integration/issues/test_72.py
+++ b/tests/integration/issues/test_72.py
@@ -7,8 +7,7 @@
 from intercom import Event
 from intercom import User
 
-Intercom.app_id = os.environ.get('INTERCOM_APP_ID')
-Intercom.app_api_key = os.environ.get('INTERCOM_APP_API_KEY')
+Intercom.personal_access_token = os.environ.get('INTERCOM_PERSONAL_ACCESS_TOKEN')
 
 
 class Issue72Test(unittest.TestCase):
diff --git a/tests/integration/issues/test_73.py b/tests/integration/issues/test_73.py
index cc5ce90c..87420042 100644
--- a/tests/integration/issues/test_73.py
+++ b/tests/integration/issues/test_73.py
@@ -8,8 +8,7 @@
 from intercom import Intercom
 from intercom import User
 
-Intercom.app_id = os.environ.get('INTERCOM_APP_ID')
-Intercom.app_api_key = os.environ.get('INTERCOM_APP_API_KEY')
+Intercom.personal_access_token = os.environ.get('INTERCOM_PERSONAL_ACCESS_TOKEN')
 
 
 class Issue73Test(unittest.TestCase):
diff --git a/tests/integration/test_admin.py b/tests/integration/test_admin.py
index 22d59381..e896b941 100644
--- a/tests/integration/test_admin.py
+++ b/tests/integration/test_admin.py
@@ -5,8 +5,7 @@
 from intercom import Intercom
 from intercom import Admin
 
-Intercom.app_id = os.environ.get('INTERCOM_APP_ID')
-Intercom.app_api_key = os.environ.get('INTERCOM_APP_API_KEY')
+Intercom.personal_access_token = os.environ.get('INTERCOM_PERSONAL_ACCESS_TOKEN')
 
 
 class AdminTest(unittest.TestCase):
diff --git a/tests/integration/test_company.py b/tests/integration/test_company.py
index e7e285b1..7c098380 100644
--- a/tests/integration/test_company.py
+++ b/tests/integration/test_company.py
@@ -10,8 +10,7 @@
 from . import get_or_create_company
 from . import get_timestamp
 
-Intercom.app_id = os.environ.get('INTERCOM_APP_ID')
-Intercom.app_api_key = os.environ.get('INTERCOM_APP_API_KEY')
+Intercom.personal_access_token = os.environ.get('INTERCOM_PERSONAL_ACCESS_TOKEN')
 
 
 class CompanyTest(unittest.TestCase):
diff --git a/tests/integration/test_conversations.py b/tests/integration/test_conversations.py
index 0a5655cb..af2f98f2 100644
--- a/tests/integration/test_conversations.py
+++ b/tests/integration/test_conversations.py
@@ -10,8 +10,7 @@
 from . import get_or_create_user
 from . import get_timestamp
 
-Intercom.app_id = os.environ.get('INTERCOM_APP_ID')
-Intercom.app_api_key = os.environ.get('INTERCOM_APP_API_KEY')
+Intercom.personal_access_token = os.environ.get('INTERCOM_PERSONAL_ACCESS_TOKEN')
 
 
 class ConversationTest(unittest.TestCase):
diff --git a/tests/integration/test_count.py b/tests/integration/test_count.py
index 806c33cd..51435ddb 100644
--- a/tests/integration/test_count.py
+++ b/tests/integration/test_count.py
@@ -15,8 +15,7 @@
 from . import get_or_create_user
 from . import delete
 
-Intercom.app_id = os.environ.get('INTERCOM_APP_ID')
-Intercom.app_api_key = os.environ.get('INTERCOM_APP_API_KEY')
+Intercom.personal_access_token = os.environ.get('INTERCOM_PERSONAL_ACCESS_TOKEN')
 
 
 class CountTest(unittest.TestCase):
diff --git a/tests/integration/test_notes.py b/tests/integration/test_notes.py
index eba0a03b..815dc668 100644
--- a/tests/integration/test_notes.py
+++ b/tests/integration/test_notes.py
@@ -8,8 +8,7 @@
 from . import get_or_create_user
 from . import get_timestamp
 
-Intercom.app_id = os.environ.get('INTERCOM_APP_ID')
-Intercom.app_api_key = os.environ.get('INTERCOM_APP_API_KEY')
+Intercom.personal_access_token = os.environ.get('INTERCOM_PERSONAL_ACCESS_TOKEN')
 
 
 class NoteTest(unittest.TestCase):
diff --git a/tests/integration/test_segments.py b/tests/integration/test_segments.py
index d9b54f80..f9438db5 100644
--- a/tests/integration/test_segments.py
+++ b/tests/integration/test_segments.py
@@ -7,8 +7,7 @@
 from intercom import Intercom
 from intercom import Segment
 
-Intercom.app_id = os.environ.get('INTERCOM_APP_ID')
-Intercom.app_api_key = os.environ.get('INTERCOM_APP_API_KEY')
+Intercom.personal_access_token = os.environ.get('INTERCOM_PERSONAL_ACCESS_TOKEN')
 
 
 class SegmentTest(unittest.TestCase):
diff --git a/tests/integration/test_tags.py b/tests/integration/test_tags.py
index cf7579a5..4cf4663a 100644
--- a/tests/integration/test_tags.py
+++ b/tests/integration/test_tags.py
@@ -11,8 +11,7 @@
 from . import get_or_create_user
 from . import get_timestamp
 
-Intercom.app_id = os.environ.get('INTERCOM_APP_ID')
-Intercom.app_api_key = os.environ.get('INTERCOM_APP_API_KEY')
+Intercom.personal_access_token = os.environ.get('INTERCOM_PERSONAL_ACCESS_TOKEN')
 
 
 class TagTest(unittest.TestCase):
diff --git a/tests/integration/test_user.py b/tests/integration/test_user.py
index 73fcd9f2..ce833c70 100644
--- a/tests/integration/test_user.py
+++ b/tests/integration/test_user.py
@@ -8,8 +8,7 @@
 from . import get_or_create_user
 from . import delete
 
-Intercom.app_id = os.environ.get('INTERCOM_APP_ID')
-Intercom.app_api_key = os.environ.get('INTERCOM_APP_API_KEY')
+Intercom.personal_access_token = os.environ.get('INTERCOM_PERSONAL_ACCESS_TOKEN')
 
 
 class UserTest(unittest.TestCase):
diff --git a/tests/unit/test_intercom.py b/tests/unit/test_intercom.py
index b6534d82..5bb89935 100644
--- a/tests/unit/test_intercom.py
+++ b/tests/unit/test_intercom.py
@@ -15,25 +15,22 @@ class ExpectingArgumentsTest(unittest.TestCase):
 
     def setUp(self):  # noqa
         self.intercom = intercom.Intercom
-        self.intercom.app_id = 'abc123'
-        self.intercom.app_api_key = 'super-secret-key'
+        self.intercom.personal_access_token = 'super-personal-access-token'
 
     @istest
-    def it_raises_argumenterror_if_no_app_id_or_app_api_key_specified(self):  # noqa
-        self.intercom.app_id = None
-        self.intercom.app_api_key = None
+    def it_raises_argumenterror_if_no_personal_access_token_specified(self):  # noqa
+        self.intercom.personal_access_token = None
         with assert_raises(intercom.ArgumentError):
             self.intercom.target_base_url
 
     @istest
-    def it_returns_the_app_id_and_app_api_key_previously_set(self):
-        eq_(self.intercom.app_id, 'abc123')
-        eq_(self.intercom.app_api_key, 'super-secret-key')
+    def it_returns_the_personal_access_token_previously_set(self):
+        eq_(self.intercom.personal_access_token, 'super-personal-access-token')
 
     @istest
     def it_defaults_to_https_to_api_intercom_io(self):
         eq_(self.intercom.target_base_url,
-            'https://abc123:super-secret-key@api.intercom.io')
+            'https://super-personal-access-token:@api.intercom.io')
 
 
 class OverridingProtocolHostnameTest(unittest.TestCase):
@@ -54,20 +51,20 @@ def it_allows_overriding_of_the_endpoint_and_protocol(self):
         self.intercom.hostname = "localhost:3000"
         eq_(
             self.intercom.target_base_url,
-            "http://abc123:super-secret-key@localhost:3000")
+            "http://super-personal-access-token:@localhost:3000")
 
     @istest
     def it_prefers_endpoints(self):
         self.intercom.endpoint = "https://localhost:7654"
         eq_(self.intercom.target_base_url,
-            "https://abc123:super-secret-key@localhost:7654")
+            "https://super-personal-access-token:@localhost:7654")
 
         # turn off the shuffle
         with mock.patch("random.shuffle") as mock_shuffle:
             mock_shuffle.return_value = ["http://example.com", "https://localhost:7654"]  # noqa
             self.intercom.endpoints = ["http://example.com", "https://localhost:7654"]  # noqa
             eq_(self.intercom.target_base_url,
-                'http://abc123:super-secret-key@example.com')
+                'http://super-personal-access-token:@example.com')
 
     @istest
     def it_has_endpoints(self):