diff --git a/src/orb/types/customers/credit_list_by_external_id_response.py b/src/orb/types/customers/credit_list_by_external_id_response.py
index 9d8f6d2c..7ee5a3d6 100644
--- a/src/orb/types/customers/credit_list_by_external_id_response.py
+++ b/src/orb/types/customers/credit_list_by_external_id_response.py
@@ -14,6 +14,8 @@ class CreditListByExternalIDResponse(BaseModel):
 
     balance: float
 
+    effective_date: Optional[datetime] = None
+
     expiry_date: Optional[datetime] = None
 
     per_unit_cost_basis: Optional[str] = None
diff --git a/src/orb/types/customers/credit_list_response.py b/src/orb/types/customers/credit_list_response.py
index 494c10e0..58560b5b 100644
--- a/src/orb/types/customers/credit_list_response.py
+++ b/src/orb/types/customers/credit_list_response.py
@@ -14,6 +14,8 @@ class CreditListResponse(BaseModel):
 
     balance: float
 
+    effective_date: Optional[datetime] = None
+
     expiry_date: Optional[datetime] = None
 
     per_unit_cost_basis: Optional[str] = None