diff --git a/README.md b/README.md
index 47ff7a6..60628c6 100644
--- a/README.md
+++ b/README.md
@@ -180,6 +180,32 @@ Class | Method | HTTP request
  - [TransactionProduct](docs/TransactionProduct.md)
 
 
+## Documentation For Authorization
+
+
+## oauth2
+
+- **Type**: OAuth
+- **Flow**: accessCode
+- **Authorization URL**: `https://connect.squareup.com/oauth2/authorize?<PARAMETERS>`
+- **Scopes**: 
+ - **MERCHANT_PROFILE_READ**: GET endpoints related to a merchant's business and location entities. Almost all Connect API applications need this permission in order to obtain a merchant's location IDs
+ - **PAYMENTS_READ**: GET endpoints related to transactions and refunds
+ - **PAYMENTS_WRITE**: POST, PUT, and DELETE endpoints related to transactions and refunds. E-commerce applications must request this permission
+ - **CUSTOMERS_READ**:  GET endpoints related to customer management
+ - **CUSTOMERS_WRITE**: POST, PUT, and DELETE endpoints related to customer management
+ - **SETTLEMENTS_READ**: GET endpoints related to settlements (deposits)
+ - **BANK_ACCOUNTS_READ**: GET endpoints related to a merchant's bank accounts
+ - **ITEMS_READ**: GET endpoints related to a merchant's item library
+ - **ITEMS_WRITE**: POST, PUT, and DELETE endpoints related to a merchant's item library
+ - **ORDERS_READ**: GET endpoints related to a merchant's Square online store.
+ - **ORDERS_WRITE**: POST, PUT, and DELETE endpoints related to a merchant's Square online store
+ - **EMPLOYEES_READ**: GET endpoints related to employee management
+ - **EMPLOYEES_WRITE**: POST, PUT, and DELETE endpoints related to employee management
+ - **TIMECARDS_READ**: GET endpoints related to employee timecards
+ - **TIMECARDS_WRITE**: POST, PUT, and DELETE endpoints related to employee timecards
+
+
 ## Contributing
 
 Send bug reports, feature requests, and code contributions to the [API
diff --git a/docs/ErrorCode.md b/docs/ErrorCode.md
index 368f041..5dea5f1 100644
--- a/docs/ErrorCode.md
+++ b/docs/ErrorCode.md
@@ -68,6 +68,7 @@ Name | Type
 **PAYMENT_NOT_REFUNDABLE** | string
 **INVALID_CARD_DATA** | string
 **IDEMPOTENCY_KEY_REUSED** | string
+**UNEXPECTED_VALUE** | string
 **CARD_DECLINED** | string
 **VERIFY_CVV_FAILURE** | string
 **VERIFY_AVS_FAILURE** | string
diff --git a/squareconnect/configuration.py b/squareconnect/configuration.py
index edaaa8a..9588560 100644
--- a/squareconnect/configuration.py
+++ b/squareconnect/configuration.py
@@ -71,6 +71,9 @@ def __init__(self):
         # Password for HTTP basic authentication
         self.password = ""
 
+        # access token for OAuth
+        self.access_token = ""
+
 
         # Logging Settings
         self.logger = {}