diff --git a/README.md b/README.md
index 4c48993..b016755 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@ A Python library for interacting with the Schwab API, providing simple access to
 
 ## Prerequisites
 1. You need to have a Schwab brokerage account.
-2. Become an Individual Developer via the [Schwab Developer Portal](https://beta-developer.schwab.com/).
+2. Become an Individual Developer via the [Schwab Developer Portal](https://developer.schwab.com/).
 3. Create an individual developer app and wait until its status is "Ready for use".
 
 ## Installation
diff --git a/pyschwab/trading.py b/pyschwab/trading.py
index 06e6a5b..07f1408 100644
--- a/pyschwab/trading.py
+++ b/pyschwab/trading.py
@@ -233,7 +233,7 @@ def _convert_order(self, order: Dict[str, Any] | Order) -> Dict[str, Any]:
             raise ValueError("Order must be a dictionary or Order object.")
         return remove_none_values(order_dict)
 
-    def get_transactions(self, start_time: datetime=None, end_time: datetime=None, symbol: str=None, types: TransactionType=TransactionType.TRADE) -> List[Transaction]:
+    def get_transactions(self, start_time: datetime=None, end_time: datetime=None, symbol: str=None, types: TransactionType=None) -> List[Transaction]:
         account_hash = self._get_account_hash()
         now = datetime.now()
         start = time_to_str(start_time or now - timedelta(days=30))
diff --git a/pyschwab/trading_models.py b/pyschwab/trading_models.py
index 7b22831..8c00768 100644
--- a/pyschwab/trading_models.py
+++ b/pyschwab/trading_models.py
@@ -4,7 +4,7 @@
 
 from .types import ActivityType, AssetType, ComplexOrderStrategyType, ExecutionType, MarketSession, OptionActionType, \
     OptionAssetType, OrderDuration, OrderInstruction, OrderStatus, OrderStrategyType, OrderType, \
-    PositionEffect, QuantityType, RequestedDestination
+    PositionEffect, QuantityType, RequestedDestination, TransactionStatus, TransactionType
 from .utils import camel_to_snake, dataclass_to_dict, to_time
 
 
@@ -43,13 +43,15 @@ class Deliverable:
     status: str
     symbol: str
     instrument_id: int
-    closing_price: float
-    type: str
+    closing_price: float = None
+    type: str = None
+    description: str = None
 
     @classmethod
     def from_dict(cls, data: Dict[str, Any]) -> 'Deliverable':
         if data is None:
             return None
+        
         converted_data = {camel_to_snake(key): value for key, value in data.items()}
         converted_data['asset_type'] = OptionAssetType.from_str(converted_data['asset_type'])
         return cls(**converted_data)
@@ -217,6 +219,11 @@ class Balance:
     short_market_value: float = 0.0
     buying_power_non_marginable_trade: float = 0.0
     sma: float = 0.0
+    cash_available_for_withdrawal: float = 0.0
+    cash_debit_call_value: float = 0.0
+    unsettled_cash: float = 0.0
+    cash_call: float = 0.0
+    long_non_marginable_market_value: float = 0.0
 
     @classmethod
     def from_dict(cls, data: Dict[str, Any]):
@@ -297,6 +304,7 @@ class OrderActivity:
     quantity: int
     order_remaining_quantity: int
     execution_legs: List[ExecutionLeg]
+    activity_id: int = None
 
     @classmethod
     def from_dict(cls, data: Dict[str, Any]) -> 'OrderActivity':
@@ -438,8 +446,8 @@ def from_dict(cls, data: Dict[str, Any]) -> 'User':
 class Transaction:
     activity_id: int
     time: datetime
-    type: str
-    status: str
+    type: TransactionType
+    status: TransactionStatus
     net_amount: float
     account_number: str
     sub_account: str
@@ -450,12 +458,14 @@ class Transaction:
     trade_date: datetime = None
     settlement_date: datetime = None
     description: str = None
-    activity_type: str = None
+    activity_type: ActivityType = None
 
     @classmethod
     def from_dict(cls, data: Dict[str, Any]) -> 'Transaction':
         converted_data = {camel_to_snake(key): value for key, value in data.items()}
         converted_data['user'] = User.from_dict(converted_data.get('user', None))
+        converted_data['type'] = TransactionType.from_str(converted_data['type'])
+        converted_data['status'] = TransactionStatus.from_str(converted_data['status'])
         for dt_key in ['time', 'trade_date', 'settlement_date']:
             dt = converted_data.get(dt_key, None)
             if dt:
diff --git a/pyschwab/types.py b/pyschwab/types.py
index a35d478..94ea712 100644
--- a/pyschwab/types.py
+++ b/pyschwab/types.py
@@ -333,6 +333,13 @@ class RequestedDestination(AutoName):
     AUTO = auto()
 
 
+class TransactionStatus(AutoName):
+    VALID = auto()
+    INVALID = auto()
+    PENDING = auto()
+    UNKNOWN = auto()
+
+
 class TransactionType(AutoName):
     TRADE = auto()
     RECEIVE_AND_DELIVER = auto()
@@ -384,8 +391,11 @@ class OptionStrategy(AutoName):
 
 
 class ActivityType(AutoName):
+    ACTIVITY_CORRECTION = auto()
     EXECUTION = auto()
     ORDER_ACTION = auto()
+    TRANSFER = auto()
+    UNKNOWN = auto()
 
 
 class ExecutionType(AutoName):