diff --git a/santander_sdk/api_client/auth.py b/santander_sdk/api_client/auth.py
index 7e9b016..f293816 100644
--- a/santander_sdk/api_client/auth.py
+++ b/santander_sdk/api_client/auth.py
@@ -1,3 +1,4 @@
+import abc
 from datetime import datetime, timedelta
 
 from requests import HTTPError, JSONDecodeError
@@ -8,19 +9,55 @@
 from santander_sdk.api_client.exceptions import SantanderRequestError
 
 
+class TokenStore(abc.ABC):
+    @abc.abstractmethod
+    def get(self) -> str | None: ...
+
+    @abc.abstractmethod
+    def set(self, token: str, expires_in: timedelta) -> None: ...
+
+
+class InMemoryTokenStore(TokenStore):
+    def __init__(self, offset=timedelta(seconds=60)):
+        self._token = None
+        self._expires_at = None
+        self._offset = offset
+
+    def get(self):
+        if self._is_expired():
+            return None
+
+        return self._token
+
+    def _is_expired(self):
+        if self._expires_at is None:
+            return True
+
+        return self._expires_at - self._offset < datetime.now()
+
+    def set(self, token: str, expires_in: timedelta):
+        self._token = token
+        self._expires_at = datetime.now() + expires_in
+
+
 class SantanderAuth(AuthBase):
     TOKEN_ENDPOINT = "/auth/oauth/v2/token"
     TIMEOUT_SECS = 60
     BEFORE_EXPIRE_TOKEN = timedelta(seconds=60)
 
-    def __init__(self, base_url, client_id, client_secret, cert_path):
+    def __init__(
+        self,
+        base_url,
+        client_id,
+        client_secret,
+        cert_path,
+        token_store=InMemoryTokenStore(),
+    ):
         self.base_url = base_url
         self.client_id = client_id
         self.client_secret = client_secret
         self.cert_path = cert_path
-
-        self._token = None
-        self.expires_at = None
+        self.token_store = token_store
 
     @classmethod
     def from_config(cls, config: SantanderClientConfiguration):
@@ -38,14 +75,12 @@ def __call__(self, r):
 
     @property
     def token(self):
-        if self.is_expired:
-            self.renew()
-
-        return self._token
+        token = self.token_store.get()
+        if not token:
+            token, expires_in = self.renew()
+            self.token_store.set(token, expires_in)
 
-    @token.setter
-    def token(self, values):
-        self._token, self.expires_at = values
+        return token
 
     def renew(self):
         session = BaseURLSession(base_url=self.base_url)
@@ -76,14 +111,4 @@ def renew(self):
             ) from e
 
         data = response.json()
-        self.token = (
-            data["access_token"],
-            datetime.now() + timedelta(seconds=data["expires_in"]),
-        )
-
-    @property
-    def is_expired(self):
-        if not self.expires_at:
-            return True
-
-        return datetime.now() > self.expires_at - self.BEFORE_EXPIRE_TOKEN
+        return data["access_token"], timedelta(seconds=data["expires_in"])
diff --git a/tests/test_auth_unit.py b/tests/test_auth_unit.py
index 01b4e3c..44faf0c 100644
--- a/tests/test_auth_unit.py
+++ b/tests/test_auth_unit.py
@@ -1,5 +1,5 @@
 from re import compile as regex
-from datetime import datetime
+from datetime import timedelta
 
 import pytest
 from freezegun import freeze_time
@@ -51,34 +51,20 @@ def test_renew_when_token_empty(auth, responses):
     assert req.headers["X-Application-Key"] == auth.client_id
 
 
-@freeze_time("2025-02-13 10:05")
 def test_renew_token_when_expired(auth, responses):
     responses.add(
         responses.POST,
         regex(".+/auth/oauth/v2/token"),
-        json={"access_token": "NEW_VALID_TOKEN", "expires_in": 120},
+        json={"access_token": "FRESH_TOKEN", "expires_in": 120},
     )
-    auth.token = "VALID_TOKEN", datetime(2025, 2, 13, 10)
+    with freeze_time("2025-02-13 10:00"):
+        auth.token_store.set("EXPIRED_TOKEN", timedelta(0))
 
-    req = PreparedRequest()
-    req.prepare("GET", "https://api.santander.com.br/orders", auth=auth)
+    with freeze_time("2025-02-13 10:01"):
+        req = PreparedRequest()
+        req.prepare("GET", "https://api.santander.com.br/orders", auth=auth)
 
-    assert req.headers["Authorization"] == "Bearer NEW_VALID_TOKEN"
-    assert auth.expires_at == datetime(2025, 2, 13, 10, 7)
-
-
-@freeze_time("2025-02-13 10:00")
-@pytest.mark.parametrize(
-    "expires_at,expected",
-    [
-        (None, True),
-        (datetime(2025, 2, 13, 10, 1), False),
-        (datetime(2025, 2, 13, 10, 0, 59), True),
-    ],
-)
-def test_is_expired(auth, expires_at, expected):
-    auth.expires_at = expires_at
-    assert auth.is_expired is expected
+    assert req.headers["Authorization"] == "Bearer FRESH_TOKEN"
 
 
 def test_invalid_credentials(auth, responses):