diff --git a/README.md b/README.md
index 938d5c5..3e2700c 100644
--- a/README.md
+++ b/README.md
@@ -304,9 +304,17 @@ is_valid = client.verify_webhook(
 )
 ```
 
-### Get System Order Status
-```python
-status = client.get_system_order_status()
+### Get System Definitions and Statuses
+```python
+order_statuses = client.get_system_order_statuses()
+basket_item_types = client.get_system_basket_item_types()
+error_codes = client.get_system_error_codes()
+payment_term_statuses = client.get_system_payment_term_statuses()
+product_types = client.get_system_product_types()
+shortcut_types = client.get_system_shortcut_types()
+transaction_payment_types = client.get_system_transaction_payment_types()
+transaction_purposes = client.get_system_transaction_purposes()
+transaction_statuses = client.get_system_transaction_statuses()
 ```
 
 ## Subscription Management
diff --git a/setup.py b/setup.py
index 44a33a2..b4e3e97 100644
--- a/setup.py
+++ b/setup.py
@@ -8,7 +8,7 @@
 
 setup(
     name="tapsilat-py",
-    version="2026.4.24.2",
+    version="2026.5.8.1",
     description="Client SDK for Tapsilat API",
     long_description=long_description,
     long_description_content_type="text/markdown",
diff --git a/tapsilat_py/client.py b/tapsilat_py/client.py
index ee4561c..7d02c83 100644
--- a/tapsilat_py/client.py
+++ b/tapsilat_py/client.py
@@ -141,6 +141,38 @@ def get_system_order_statuses(self) -> dict:
         endpoint = "/system/order-statuses"
         return self._make_request("GET", endpoint)
 
+    def get_system_basket_item_types(self) -> dict:
+        endpoint = "/system/basket-item-types"
+        return self._make_request("GET", endpoint)
+
+    def get_system_error_codes(self) -> dict:
+        endpoint = "/system/error-codes"
+        return self._make_request("GET", endpoint)
+
+    def get_system_payment_term_statuses(self) -> dict:
+        endpoint = "/system/payment-term-statuses"
+        return self._make_request("GET", endpoint)
+
+    def get_system_product_types(self) -> dict:
+        endpoint = "/system/product-types"
+        return self._make_request("GET", endpoint)
+
+    def get_system_shortcut_types(self) -> dict:
+        endpoint = "/system/shortcut-types"
+        return self._make_request("GET", endpoint)
+
+    def get_system_transaction_payment_types(self) -> dict:
+        endpoint = "/system/transaction-payment-types"
+        return self._make_request("GET", endpoint)
+
+    def get_system_transaction_purposes(self) -> dict:
+        endpoint = "/system/transaction-purposes"
+        return self._make_request("GET", endpoint)
+
+    def get_system_transaction_statuses(self) -> dict:
+        endpoint = "/system/transaction-statuses"
+        return self._make_request("GET", endpoint)
+
     def get_order(self, reference_id: str) -> OrderResponse:
         endpoint = f"/order/{reference_id}"
         response = self._make_request("GET", endpoint)
diff --git a/tests/integration/integration_test.py b/tests/integration/integration_test.py
index 0b8f2e1..97abf64 100644
--- a/tests/integration/integration_test.py
+++ b/tests/integration/integration_test.py
@@ -262,7 +262,11 @@ def test_scenario_11_order_management_operations(api_client):
     except APIException:
         pass
 
-    dummy_ref = "dummy_ref_123"
+    buyer = BuyerDTO(name="John", surname="Doe", email="test@example.com")
+    order = api_client.create_order(
+        OrderCreateDTO(amount=100.0, currency="TRY", locale="tr", buyer=buyer)
+    )
+    dummy_ref = order.reference_id
 
     # get_order_by_conversation_id
     try:
diff --git a/tests/unit/test_system_endpoints.py b/tests/unit/test_system_endpoints.py
new file mode 100644
index 0000000..36a51b0
--- /dev/null
+++ b/tests/unit/test_system_endpoints.py
@@ -0,0 +1,64 @@
+import unittest
+from unittest.mock import MagicMock, patch
+from tapsilat_py.client import TapsilatAPI
+
+class TestSystemEndpoints(unittest.TestCase):
+    def setUp(self):
+        self.api = TapsilatAPI(api_key="test_key")
+        self.api._make_request = MagicMock()
+
+    def test_get_system_basket_item_types(self):
+        expected_response = {"data": []}
+        self.api._make_request.return_value = expected_response
+        response = self.api.get_system_basket_item_types()
+        self.api._make_request.assert_called_once_with("GET", "/system/basket-item-types")
+        self.assertEqual(response, expected_response)
+
+    def test_get_system_error_codes(self):
+        expected_response = {"data": []}
+        self.api._make_request.return_value = expected_response
+        response = self.api.get_system_error_codes()
+        self.api._make_request.assert_called_once_with("GET", "/system/error-codes")
+        self.assertEqual(response, expected_response)
+
+    def test_get_system_payment_term_statuses(self):
+        expected_response = {"data": []}
+        self.api._make_request.return_value = expected_response
+        response = self.api.get_system_payment_term_statuses()
+        self.api._make_request.assert_called_once_with("GET", "/system/payment-term-statuses")
+        self.assertEqual(response, expected_response)
+
+    def test_get_system_product_types(self):
+        expected_response = {"data": []}
+        self.api._make_request.return_value = expected_response
+        response = self.api.get_system_product_types()
+        self.api._make_request.assert_called_once_with("GET", "/system/product-types")
+        self.assertEqual(response, expected_response)
+
+    def test_get_system_shortcut_types(self):
+        expected_response = {"data": []}
+        self.api._make_request.return_value = expected_response
+        response = self.api.get_system_shortcut_types()
+        self.api._make_request.assert_called_once_with("GET", "/system/shortcut-types")
+        self.assertEqual(response, expected_response)
+
+    def test_get_system_transaction_payment_types(self):
+        expected_response = {"data": []}
+        self.api._make_request.return_value = expected_response
+        response = self.api.get_system_transaction_payment_types()
+        self.api._make_request.assert_called_once_with("GET", "/system/transaction-payment-types")
+        self.assertEqual(response, expected_response)
+
+    def test_get_system_transaction_purposes(self):
+        expected_response = {"data": []}
+        self.api._make_request.return_value = expected_response
+        response = self.api.get_system_transaction_purposes()
+        self.api._make_request.assert_called_once_with("GET", "/system/transaction-purposes")
+        self.assertEqual(response, expected_response)
+
+    def test_get_system_transaction_statuses(self):
+        expected_response = {"data": []}
+        self.api._make_request.return_value = expected_response
+        response = self.api.get_system_transaction_statuses()
+        self.api._make_request.assert_called_once_with("GET", "/system/transaction-statuses")
+        self.assertEqual(response, expected_response)