diff --git a/src/bitpay/models/invoice/invoice.py b/src/bitpay/models/invoice/invoice.py
index 7719657..2ff8554 100644
--- a/src/bitpay/models/invoice/invoice.py
+++ b/src/bitpay/models/invoice/invoice.py
@@ -6,7 +6,7 @@
 from pydantic import Field
 from .buyer import Buyer
 from .buyer_provided_info import BuyerProvidedInfo
-from .invoice_refund_addresses import InvoiceRefundAddresses
+from .invoice_refund_addresses import InvoiceRefundAddress
 from .miner_fees import MinerFees
 from .refund_info import RefundInfo
 from .shopper import Shopper
@@ -48,7 +48,7 @@ class Invoice(BitPayModel):
     payment_codes: Union[Dict[str, Dict[str, str]], None] = None
     acceptance_window: Union[int, None] = None
     buyer: Union[Buyer, None] = None
-    refund_addresses: Union[List[Dict[str, InvoiceRefundAddresses]], None] = None
+    refund_addresses: Union[List[Dict[str, InvoiceRefundAddress]], None] = None
     close_url: Union[str, None] = Field(alias="closeURL", default=None)
     auto_redirect: Union[bool, None] = False
     json_paypro_required: Union[bool, None] = False
diff --git a/src/bitpay/models/invoice/invoice_refund_addresses.py b/src/bitpay/models/invoice/invoice_refund_addresses.py
index 8820722..122838d 100644
--- a/src/bitpay/models/invoice/invoice_refund_addresses.py
+++ b/src/bitpay/models/invoice/invoice_refund_addresses.py
@@ -5,9 +5,9 @@
 from bitpay.models.bitpay_model import BitPayModel
 
 
-class InvoiceRefundAddresses(BitPayModel):
-    date: Union[datetime, None]
-    email: Union[str, None]
+class InvoiceRefundAddress(BitPayModel):
+    date: Union[datetime, None] = None
+    email: Union[str, None] = None
     tag: Union[int, None] = None
     type: Union[str, None] = None