diff --git a/docs/integrations/fedapay.md b/docs/integrations/fedapay.md
index 0dd4367..8782755 100644
--- a/docs/integrations/fedapay.md
+++ b/docs/integrations/fedapay.md
@@ -149,12 +149,13 @@ Initiate a payment transaction using EasySwitch's `TransactionDetail` class and
 transaction = TransactionDetail(
     transaction_id="TXN-123456",  # Unique ID generated by your system
     provider=Provider.FEDAPAY,
+    status=TransactionStatus.PENDING,
     amount=1000.0,  # Amount in cents (10 XOF)
     currency=Currency.XOF,
     transaction_type=TransactionType.PAYMENT,
     customer=CustomerInfo(
-        firstname="John",
-        lastname="Doe",
+        first_name="John",
+        last_name="Doe",
         email="john.doe@email.com", # FedaPay doesn't support many customer with same email
         phone_number="+22990123456"
     ),
@@ -557,8 +558,8 @@ The `CustomerInfo` class standardizes customer data across all providers:
 ```python
 @dataclass
 class CustomerInfo:
-    firstname: str
-    lastname: str
+    first_name: str
+    last_name: str
     email: str
     phone_number: str
     id: Optional[str] = None
@@ -766,8 +767,8 @@ class FedaPayIntegration:
                 currency=currency,
                 transaction_type=TransactionType.PAYMENT,
                 customer=CustomerInfo(
-                    firstname=customer_info["firstname"],
-                    lastname=customer_info["lastname"],
+                    first_name=customer_info["first_name"],
+                    last_name=customer_info["last_name"],
                     email=customer_info["email"],
                     phone_number=customer_info["phone_number"]
                 ),
@@ -848,8 +849,8 @@ def main():
     
     # Test customer data
     customer = CustomerInfo(
-        firstname="John",
-        lastname="Doe",
+        first_name="John",
+        last_name="Doe",
         email="john.doe@example.com",
         phone_number="+22990000001"  # Test number for success
     )
@@ -861,8 +862,8 @@ def main():
         currency=Currency.XOF,
         description="Test Payment with EasySwitch",
         customer_info={
-            "firstname": customer.firstname,
-            "lastname": customer.lastname,
+            "first_name": customer.first_name,
+            "last_name": customer.last_name,
             "email": customer.email,
             "phone_number": customer.phone_number
         },
diff --git a/easyswitch/conf/base.py b/easyswitch/conf/base.py
index 9f9945f..86a1207 100644
--- a/easyswitch/conf/base.py
+++ b/easyswitch/conf/base.py
@@ -7,7 +7,7 @@
 from pathlib import Path
 from typing import Any, Dict, Optional, Type
 
-from pydantic import BaseModel, Field, field_validator, model_validator
+from pydantic import BaseModel, Field, field_validator, model_validator, ValidationInfo
 
 from easyswitch.exceptions import ConfigurationError
 from easyswitch.types import Currency, Provider
@@ -61,7 +61,7 @@ class BaseConfigModel(BaseModel):
 
     class Config:
         extra = 'forbid'  # Undefined fields are not allowed
-        validate_all = True
+        validate_default = True
         use_enum_values = True
 
 
@@ -127,17 +127,20 @@ class RootConfig(BaseConfigModel):
     default_provider: Optional[Provider] = None
     
     @field_validator('default_provider')
-    def validate_default_provider(cls, v, values):
+    @classmethod
+    def validate_default_provider(cls, v, info: ValidationInfo):
         """Ensure default provider is valid."""
-
+        
         # Ensure default provider is in enabled providers
-        if v is not None and 'providers' in values and v not in values['providers']:
-            raise ValueError(
-                f"Default provider {v} must be in enabled providers"
-            )
+        if v is not None:
+            providers = info.data.get('providers')
+            if providers and v not in providers:
+                raise ValueError(
+                    f"Default provider {v} must be in enabled providers"
+                )
         
         # and in supported Providers
-        if v not in Provider.__members__:
+        if v is not None and v not in Provider.__members__:
             raise ValueError(
                 f"Default provider {v} is not supported"
             )