diff --git a/README.md b/README.md
index 2778047..43b8a51 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # MYOB Api
 
-[MYOB Api](https://github.com/davidlumley/myob-api) is an interface for accessing [MYOB](http://developer.myob.com/api/accountright/v2/)'s  AccountRight Live API.
+[MYOB Api](https://github.com/davidlumley/myob-api) is an interface for accessing [MYOB](http://developer.myob.com/api/accountright/v2/)'s AccountRight Live API.
 
 ## Installation
 
@@ -24,12 +24,12 @@ If you've already got an OAuth access token, feel free to skip to API Client Set
 
 The MYOB API uses 3 legged OAuth2. If you don't want to roll your own, or use the [OmniAuth strategy](https://github.com/davidlumley/omniauth-myob) you can authenticate using the `get_access_code_url` and `get_access_token` methods that [ghiculescu](https://github.com/ghiculescu) has provided like so:
 
-    class MYOBSessionController  
+    class MYOBSessionController
       def new
         redirect_to myob_client.get_access_code_url
       end
 
-      def create
+      def callback
         @token         = myob_client.get_access_token(params[:code])
         @company_files = myob_client.company_file.all
         # then show the user a view where they can log in to their company file
@@ -41,8 +41,13 @@ The MYOB API uses 3 legged OAuth2. If you don't want to roll your own, or use th
             :key    => YOUR_CONSUMER_KEY,
             :secret => YOUR_CONSUMER_SECRET,
           },
+          :redirect_uri => redirect_uri
         })
       end
+
+      def redirect_uri
+        callback_myob_session_url
+      end
     end
 
 ### API Client Setup
@@ -104,7 +109,7 @@ Select a company file to work with
       :password => COMPANY_FILE_PASSWORD,
     })
 
-####  Contacts
+#### Contacts
 
 Return a list of all contacts
 
@@ -167,13 +172,11 @@ To update an existing entity, call #save on its model, passing through a hash yo
     user['FirstName'] = 'New First Name'
     api_client.employee.save(user)
 
-
 ## Todo
 
-* Expand API methods
-* Refactor client factory architecture
-* Tests
-
+- Expand API methods
+- Refactor client factory architecture
+- Tests
 
 ## Contributing
 
diff --git a/lib/myob-api.rb b/lib/myob-api.rb
index 9d91fff..f0f0d8d 100644
--- a/lib/myob-api.rb
+++ b/lib/myob-api.rb
@@ -21,6 +21,10 @@
 require 'myob/api/models/customer_payment'
 require 'myob/api/models/invoice'
 require 'myob/api/models/invoice_item'
+require 'myob/api/models/invoice_miscellaneous'
+require 'myob/api/models/invoice_professional'
+require 'myob/api/models/invoice_service'
+require 'myob/api/models/invoice_time_billing'
 
 require 'myob/api/models/payroll_category'
 require 'myob/api/models/wage'
diff --git a/lib/myob/api/models/invoice_miscellaneous.rb b/lib/myob/api/models/invoice_miscellaneous.rb
new file mode 100644
index 0000000..05449f3
--- /dev/null
+++ b/lib/myob/api/models/invoice_miscellaneous.rb
@@ -0,0 +1,11 @@
+module Myob
+  module Api
+    module Model
+      class InvoiceMiscellaneous < Base
+        def model_route
+          'Sale/Invoice/Miscellaneous'
+        end
+      end
+    end
+  end
+end
diff --git a/lib/myob/api/models/invoice_professional.rb b/lib/myob/api/models/invoice_professional.rb
new file mode 100644
index 0000000..04e8e18
--- /dev/null
+++ b/lib/myob/api/models/invoice_professional.rb
@@ -0,0 +1,11 @@
+module Myob
+  module Api
+    module Model
+      class InvoiceProfessional < Base
+        def model_route
+          'Sale/Invoice/Professional'
+        end
+      end
+    end
+  end
+end
diff --git a/lib/myob/api/models/invoice_service.rb b/lib/myob/api/models/invoice_service.rb
new file mode 100644
index 0000000..ce9e584
--- /dev/null
+++ b/lib/myob/api/models/invoice_service.rb
@@ -0,0 +1,11 @@
+module Myob
+  module Api
+    module Model
+      class InvoiceService < Base
+        def model_route
+          'Sale/Invoice/Service'
+        end
+      end
+    end
+  end
+end
diff --git a/lib/myob/api/models/invoice_time_billing.rb b/lib/myob/api/models/invoice_time_billing.rb
new file mode 100644
index 0000000..6b2a9d9
--- /dev/null
+++ b/lib/myob/api/models/invoice_time_billing.rb
@@ -0,0 +1,11 @@
+module Myob
+  module Api
+    module Model
+      class InvoiceTimeBilling < Base
+        def model_route
+          'Sale/Invoice/TimeBilling'
+        end
+      end
+    end
+  end
+end