diff --git a/mpt_api_client/resources/billing/custom_ledger_attachments.py b/mpt_api_client/resources/billing/custom_ledger_attachments.py
new file mode 100644
index 00000000..bbc4454b
--- /dev/null
+++ b/mpt_api_client/resources/billing/custom_ledger_attachments.py
@@ -0,0 +1,42 @@
+from mpt_api_client.http import AsyncService, Service
+from mpt_api_client.http.mixins import (
+    AsyncDeleteMixin,
+    AsyncFileOperationsMixin,
+    AsyncUpdateMixin,
+    DeleteMixin,
+    FileOperationsMixin,
+    UpdateMixin,
+)
+from mpt_api_client.models import Model
+
+
+class CustomLedgerAttachment(Model):
+    """Custom Ledger Attachment resource."""
+
+
+class CustomLedgerAttachmentsServiceConfig:
+    """Custom Ledger Attachments service configuration."""
+
+    _endpoint = "/public/v1/billing/custom-ledgers/{custom_ledger_id}/attachments"
+    _model_class = CustomLedgerAttachment
+    _collection_key = "data"
+
+
+class CustomLedgerAttachmentsService(
+    FileOperationsMixin[CustomLedgerAttachment],
+    DeleteMixin,
+    UpdateMixin[CustomLedgerAttachment],
+    Service[CustomLedgerAttachment],
+    CustomLedgerAttachmentsServiceConfig,
+):
+    """Custom Ledger Attachments service."""
+
+
+class AsyncCustomLedgerAttachmentsService(
+    AsyncFileOperationsMixin[CustomLedgerAttachment],
+    AsyncDeleteMixin,
+    AsyncUpdateMixin[CustomLedgerAttachment],
+    AsyncService[CustomLedgerAttachment],
+    CustomLedgerAttachmentsServiceConfig,
+):
+    """Custom Ledger Attachments service."""
diff --git a/mpt_api_client/resources/billing/custom_ledgers.py b/mpt_api_client/resources/billing/custom_ledgers.py
index c24ffbec..70206e59 100644
--- a/mpt_api_client/resources/billing/custom_ledgers.py
+++ b/mpt_api_client/resources/billing/custom_ledgers.py
@@ -8,6 +8,10 @@
     UpdateMixin,
 )
 from mpt_api_client.models import Model
+from mpt_api_client.resources.billing.custom_ledger_attachments import (
+    AsyncCustomLedgerAttachmentsService,
+    CustomLedgerAttachmentsService,
+)
 from mpt_api_client.resources.billing.custom_ledger_charges import (
     AsyncCustomLedgerChargesService,
     CustomLedgerChargesService,
@@ -55,6 +59,13 @@ def upload(self, custom_ledger_id: str) -> CustomLedgerUploadService:
             endpoint_params={"custom_ledger_id": custom_ledger_id},
         )
 
+    def attachments(self, custom_ledger_id: str) -> CustomLedgerAttachmentsService:
+        """Return custom ledger attachments service."""
+        return CustomLedgerAttachmentsService(
+            http_client=self.http_client,
+            endpoint_params={"custom_ledger_id": custom_ledger_id},
+        )
+
 
 class AsyncCustomLedgersService(
     AsyncCreateMixin[CustomLedger],
@@ -79,3 +90,10 @@ def upload(self, custom_ledger_id: str) -> AsyncCustomLedgerUploadService:
             http_client=self.http_client,
             endpoint_params={"custom_ledger_id": custom_ledger_id},
         )
+
+    def attachments(self, custom_ledger_id: str) -> AsyncCustomLedgerAttachmentsService:
+        """Return custom ledger attachments service."""
+        return AsyncCustomLedgerAttachmentsService(
+            http_client=self.http_client,
+            endpoint_params={"custom_ledger_id": custom_ledger_id},
+        )
diff --git a/tests/resources/billing/test_custom_ledger_attachments.py b/tests/resources/billing/test_custom_ledger_attachments.py
new file mode 100644
index 00000000..320abffd
--- /dev/null
+++ b/tests/resources/billing/test_custom_ledger_attachments.py
@@ -0,0 +1,42 @@
+import pytest
+
+from mpt_api_client.resources.billing.custom_ledger_attachments import (
+    AsyncCustomLedgerAttachmentsService,
+    CustomLedgerAttachmentsService,
+)
+
+
+@pytest.fixture
+def custom_ledger_attachments_service(http_client):
+    return CustomLedgerAttachmentsService(
+        http_client=http_client, endpoint_params={"custom_ledger_id": "LDG-0000-0001"}
+    )
+
+
+@pytest.fixture
+def async_custom_ledger_attachments_service(async_http_client):
+    return AsyncCustomLedgerAttachmentsService(
+        http_client=async_http_client, endpoint_params={"custom_ledger_id": "LDG-0000-0001"}
+    )
+
+
+def test_endpoint(custom_ledger_attachments_service):
+    assert custom_ledger_attachments_service.endpoint == (
+        "/public/v1/billing/custom-ledgers/LDG-0000-0001/attachments"
+    )
+
+
+def test_async_endpoint(async_custom_ledger_attachments_service):
+    assert async_custom_ledger_attachments_service.endpoint == (
+        "/public/v1/billing/custom-ledgers/LDG-0000-0001/attachments"
+    )
+
+
+@pytest.mark.parametrize("method", ["get", "create", "update", "delete"])
+def test_methods_present(custom_ledger_attachments_service, method: str):
+    assert hasattr(custom_ledger_attachments_service, method)
+
+
+@pytest.mark.parametrize("method", ["get", "create", "update", "delete"])
+def test_async_methods_present(async_custom_ledger_attachments_service, method: str):
+    assert hasattr(async_custom_ledger_attachments_service, method)
diff --git a/tests/resources/billing/test_custom_ledgers.py b/tests/resources/billing/test_custom_ledgers.py
index 9913979d..ba56c772 100644
--- a/tests/resources/billing/test_custom_ledgers.py
+++ b/tests/resources/billing/test_custom_ledgers.py
@@ -1,5 +1,9 @@
 import pytest
 
+from mpt_api_client.resources.billing.custom_ledger_attachments import (
+    AsyncCustomLedgerAttachmentsService,
+    CustomLedgerAttachmentsService,
+)
 from mpt_api_client.resources.billing.custom_ledger_charges import (
     AsyncCustomLedgerChargesService,
     CustomLedgerChargesService,
@@ -39,6 +43,7 @@ def test_async_mixins_present(async_custom_ledgers_service, method):
     [
         ("charges", CustomLedgerChargesService),
         ("upload", CustomLedgerUploadService),
+        ("attachments", CustomLedgerAttachmentsService),
     ],
 )
 def test_property_services(custom_ledgers_service, service_method, expected_service_class):
@@ -53,6 +58,7 @@ def test_property_services(custom_ledgers_service, service_method, expected_serv
     [
         ("charges", AsyncCustomLedgerChargesService),
         ("upload", AsyncCustomLedgerUploadService),
+        ("attachments", AsyncCustomLedgerAttachmentsService),
     ],
 )
 def test_async_property_services(