diff --git a/src/tinkoff/bank.py b/src/tinkoff/bank.py
index f1e86c4afaa..1b9200a69c0 100644
--- a/src/tinkoff/bank.py
+++ b/src/tinkoff/bank.py
@@ -20,6 +20,17 @@ class TinkoffBank(Bank):
     def get_initial_payment_url(self) -> str:
         return self.Init()["PaymentURL"]
 
+    def refund(self) -> None:
+        last_payment_notification = self.order.tinkoff_payment_notifications.order_by("-id")[0]
+
+        self.call(
+            "Cancel",
+            payload={
+                "PaymentId": last_payment_notification.payment_id,
+                "Receipt": self.get_receipt(),
+            },
+        )
+
     def Init(self) -> dict:
         return self.call(
             "Init",
@@ -86,7 +97,7 @@ def _get_token(request: dict) -> str:
         _request["Password"] = settings.TINKOFF_TERMINAL_PASSWORD
 
         sorted_request = OrderedDict(sorted(_request.items(), key=lambda key, *args: key))
-        return sha256("".join(str(value) for value in sorted_request.values()).encode()).hexdigest().upper()
+        return sha256("".join(str(value) for value in sorted_request.values()).encode()).hexdigest()
 
     @staticmethod
     def get_notification_url() -> str:
diff --git a/src/tinkoff/tests/bank_client/tests_tinkoff_refund.py b/src/tinkoff/tests/bank_client/tests_tinkoff_refund.py
new file mode 100644
index 00000000000..8bf77852f00
--- /dev/null
+++ b/src/tinkoff/tests/bank_client/tests_tinkoff_refund.py
@@ -0,0 +1,50 @@
+import pytest
+
+from tinkoff.bank import TinkoffBank
+
+pytestmark = [
+    pytest.mark.django_db,
+]
+
+
+@pytest.fixture
+def paid_tinkoff_order(order, mixer):
+    order.setattr_and_save("bank_id", "tinkoff_bank")
+    order.set_paid()
+
+    mixer.blend("tinkoff.PaymentNotification", order=order, payment_id=9001)
+    return order
+
+
+@pytest.fixture
+def refund_success_response():
+    return {
+        "Success": True,
+        "ErrorCode": "0",
+        "TerminalKey": "k3y",
+        "Status": "REFUNDED",
+        "PaymentId": "9001",
+        "OrderId": "8P4GtFYc3fuaoVTTMa9EZt",
+        "OriginalAmount": 10050000,
+        "NewAmount": 0,
+    }
+
+
+@pytest.fixture(autouse=True)
+def add_tinkoff_refund_response(respx_mock, refund_success_response):
+    return respx_mock.post("https://securepay.tinkoff.ru/v2/Cancel/").respond(json=refund_success_response)
+
+
+@pytest.fixture
+def tinkoff(paid_tinkoff_order):
+    return TinkoffBank(order=paid_tinkoff_order)
+
+
+def test_send_correct_refund_request(tinkoff, retrieve_request_json):
+    tinkoff.refund()
+
+    refund_request = retrieve_request_json()
+    assert refund_request["PaymentId"] == 9001
+    assert "Receipt" in refund_request
+    assert "TerminalKey" in refund_request
+    assert "Token" in refund_request
diff --git a/src/tinkoff/tests/bank_client/tests_tinkoff_request_signing.py b/src/tinkoff/tests/bank_client/tests_tinkoff_request_signing.py
index b7390ada17a..7c20355b853 100644
--- a/src/tinkoff/tests/bank_client/tests_tinkoff_request_signing.py
+++ b/src/tinkoff/tests/bank_client/tests_tinkoff_request_signing.py
@@ -34,17 +34,17 @@ def reference_request():
 
 
 def test_signature(tinkoff, reference_request):
-    assert tinkoff._get_token(reference_request) == "597C160C8C348FB14C63C820C54B712468923A74FD111AC6B0ECDA01FB5F4716"
+    assert tinkoff._get_token(reference_request) == "597c160c8c348fb14c63c820c54b712468923a74fd111ac6b0ecda01fb5f4716"
 
 
 def test_signature_without_data_and_receipt(tinkoff, reference_request):
     del reference_request["DATA"]
     del reference_request["Receipt"]
 
-    assert tinkoff._get_token(reference_request) == "597C160C8C348FB14C63C820C54B712468923A74FD111AC6B0ECDA01FB5F4716"
+    assert tinkoff._get_token(reference_request) == "597c160c8c348fb14c63c820c54b712468923a74fd111ac6b0ecda01fb5f4716"
 
 
 def test_signature_with_integer_int(tinkoff, reference_request):
     reference_request["OrderId"] = 100500
 
-    assert tinkoff._get_token(reference_request) == "2F182D493F0488BDE0750D1BDB8B1DE3A10BBE0A38358A89C8EA93972A55F453"
+    assert tinkoff._get_token(reference_request) == "2f182d493f0488bde0750d1bdb8b1de3a10bbe0a38358a89c8ea93972a55f453"
diff --git a/src/tinkoff/tests/conftest.py b/src/tinkoff/tests/conftest.py
index a92f0071daa..086b50b3048 100644
--- a/src/tinkoff/tests/conftest.py
+++ b/src/tinkoff/tests/conftest.py
@@ -1,5 +1,8 @@
+import json
 import pytest
 
+from respx import MockRouter
+
 
 @pytest.fixture
 def course(factory):
@@ -17,3 +20,8 @@ def user(mixer):
 @pytest.fixture
 def order(factory, user, course):
     return factory.order(user=user, item=course, price="100500")
+
+
+@pytest.fixture
+def retrieve_request_json(respx_mock: MockRouter):
+    return lambda: json.loads(respx_mock.calls.last.request.content)
diff --git a/src/tinkoff/tests/dolyame_client/conftest.py b/src/tinkoff/tests/dolyame_client/conftest.py
index e7d691b502d..e23dcfe4ada 100644
--- a/src/tinkoff/tests/dolyame_client/conftest.py
+++ b/src/tinkoff/tests/dolyame_client/conftest.py
@@ -1,8 +1,5 @@
-import json
 import pytest
 
-from respx import MockRouter
-
 from tinkoff.dolyame import Dolyame
 
 pytestmark = [pytest.mark.django_db]
@@ -23,8 +20,3 @@ def _absolute_host(settings):
 @pytest.fixture
 def dolyame(order):
     return Dolyame(order=order)
-
-
-@pytest.fixture
-def retrieve_request_json(respx_mock: MockRouter):
-    return lambda: json.loads(respx_mock.calls.last.request.content)