diff --git a/mpt_api_client/resources/billing/credit_memo_attachments.py b/mpt_api_client/resources/billing/credit_memo_attachments.py
new file mode 100644
index 0000000..0db2b29
--- /dev/null
+++ b/mpt_api_client/resources/billing/credit_memo_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 CreditMemoAttachment(Model):
+    """Credit Memo Attachment resource."""
+
+
+class CreditMemoAttachmentsServiceConfig:
+    """Credit Memo Attachments service configuration."""
+
+    _endpoint = "/public/v1/billing/credit-memos/{credit_memo_id}/attachments"
+    _model_class = CreditMemoAttachment
+    _collection_key = "data"
+
+
+class CreditMemoAttachmentsService(
+    FileOperationsMixin[CreditMemoAttachment],
+    DeleteMixin,
+    UpdateMixin[CreditMemoAttachment],
+    Service[CreditMemoAttachment],
+    CreditMemoAttachmentsServiceConfig,
+):
+    """Credit Memo Attachments service."""
+
+
+class AsyncCreditMemoAttachmentsService(
+    AsyncFileOperationsMixin[CreditMemoAttachment],
+    AsyncDeleteMixin,
+    AsyncUpdateMixin[CreditMemoAttachment],
+    AsyncService[CreditMemoAttachment],
+    CreditMemoAttachmentsServiceConfig,
+):
+    """Credit Memo Attachments service."""
diff --git a/mpt_api_client/resources/billing/credit_memos.py b/mpt_api_client/resources/billing/credit_memos.py
index 4c7ca38..524d8d7 100644
--- a/mpt_api_client/resources/billing/credit_memos.py
+++ b/mpt_api_client/resources/billing/credit_memos.py
@@ -6,6 +6,10 @@
     UpdateMixin,
 )
 from mpt_api_client.models import Model
+from mpt_api_client.resources.billing.credit_memo_attachments import (
+    AsyncCreditMemoAttachmentsService,
+    CreditMemoAttachmentsService,
+)
 
 
 class CreditMemo(Model):
@@ -28,6 +32,13 @@ class CreditMemosService(
 ):
     """Credit Memos service."""
 
+    def attachments(self, credit_memo_id: str) -> CreditMemoAttachmentsService:
+        """Return credit memo attachments service."""
+        return CreditMemoAttachmentsService(
+            http_client=self.http_client,
+            endpoint_params={"credit_memo_id": credit_memo_id},
+        )
+
 
 class AsyncCreditMemosService(
     AsyncCreateMixin[CreditMemo],
@@ -36,3 +47,10 @@ class AsyncCreditMemosService(
     CreditMemosServiceConfig,
 ):
     """Async Credit Memos service."""
+
+    def attachments(self, credit_memo_id: str) -> AsyncCreditMemoAttachmentsService:
+        """Return credit memo attachments service."""
+        return AsyncCreditMemoAttachmentsService(
+            http_client=self.http_client,
+            endpoint_params={"credit_memo_id": credit_memo_id},
+        )
diff --git a/tests/resources/billing/test_credit_memo_attachments.py b/tests/resources/billing/test_credit_memo_attachments.py
new file mode 100644
index 0000000..afc00fa
--- /dev/null
+++ b/tests/resources/billing/test_credit_memo_attachments.py
@@ -0,0 +1,44 @@
+import pytest
+
+from mpt_api_client.resources.billing.credit_memo_attachments import (
+    AsyncCreditMemoAttachmentsService,
+    CreditMemoAttachmentsService,
+)
+
+
+@pytest.fixture
+def credit_memo_attachments_service(http_client):
+    return CreditMemoAttachmentsService(
+        http_client=http_client, endpoint_params={"credit_memo_id": "CRM-0000-0001"}
+    )
+
+
+@pytest.fixture
+def async_credit_memo_attachments_service(async_http_client):
+    return AsyncCreditMemoAttachmentsService(
+        http_client=async_http_client, endpoint_params={"credit_memo_id": "CRM-0000-0001"}
+    )
+
+
+def test_endpoint(credit_memo_attachments_service):
+    assert (
+        credit_memo_attachments_service.endpoint
+        == "/public/v1/billing/credit-memos/CRM-0000-0001/attachments"
+    )
+
+
+def test_async_endpoint(async_credit_memo_attachments_service):
+    assert (
+        async_credit_memo_attachments_service.endpoint
+        == "/public/v1/billing/credit-memos/CRM-0000-0001/attachments"
+    )
+
+
+@pytest.mark.parametrize("method", ["get", "create", "update", "delete"])
+def test_methods_present(credit_memo_attachments_service, method: str):
+    assert hasattr(credit_memo_attachments_service, method)
+
+
+@pytest.mark.parametrize("method", ["get", "create", "update", "delete"])
+def test_async_methods_present(async_credit_memo_attachments_service, method: str):
+    assert hasattr(async_credit_memo_attachments_service, method)
diff --git a/tests/resources/billing/test_credit_memos.py b/tests/resources/billing/test_credit_memos.py
index 8f7d524..b67b876 100644
--- a/tests/resources/billing/test_credit_memos.py
+++ b/tests/resources/billing/test_credit_memos.py
@@ -1,5 +1,9 @@
 import pytest
 
+from mpt_api_client.resources.billing.credit_memo_attachments import (
+    AsyncCreditMemoAttachmentsService,
+    CreditMemoAttachmentsService,
+)
 from mpt_api_client.resources.billing.credit_memos import (
     AsyncCreditMemosService,
     CreditMemosService,
@@ -30,3 +34,31 @@ def test_mixins_present(credit_memos_service, method):
 )
 def test_async_mixins_present(async_credit_memos_service, method):
     assert hasattr(async_credit_memos_service, method)
+
+
+@pytest.mark.parametrize(
+    ("service_method", "expected_service_class"),
+    [
+        ("attachments", CreditMemoAttachmentsService),
+    ],
+)
+def test_property_services(credit_memos_service, service_method, expected_service_class):
+    service = getattr(credit_memos_service, service_method)("CRM-0000-0001")
+
+    assert isinstance(service, expected_service_class)
+    assert service.endpoint_params == {"credit_memo_id": "CRM-0000-0001"}
+
+
+@pytest.mark.parametrize(
+    ("service_method", "expected_service_class"),
+    [
+        ("attachments", AsyncCreditMemoAttachmentsService),
+    ],
+)
+def test_async_property_services(
+    async_credit_memos_service, service_method, expected_service_class
+):
+    service = getattr(async_credit_memos_service, service_method)("CRM-0000-0001")
+
+    assert isinstance(service, expected_service_class)
+    assert service.endpoint_params == {"credit_memo_id": "CRM-0000-0001"}