diff --git a/custom_components/unifi_voucher/api.py b/custom_components/unifi_voucher/api.py
index 19cb4bf..4c05e8a 100644
--- a/custom_components/unifi_voucher/api.py
+++ b/custom_components/unifi_voucher/api.py
@@ -2,29 +2,21 @@
 from __future__ import annotations
 
 import asyncio
-import ssl
 from dataclasses import dataclass
 
 from aiohttp import CookieJar
 import aiounifi
-from aiounifi.interfaces.api_handlers import ItemEvent
-from aiounifi.interfaces.sites import Sites
 from aiounifi.models.configuration import Configuration
-from aiounifi.models.api import ApiItem, ApiRequest
+from aiounifi.models.api import ApiRequest
 
 from homeassistant.core import (
     callback,
     HomeAssistant,
 )
 from homeassistant.helpers import aiohttp_client
-from homeassistant.helpers.dispatcher import (
-    async_dispatcher_connect,
-    async_dispatcher_send,
-)
 
 from .const import (
     LOGGER,
-    DOMAIN,
 )
 
 RETRY_TIMER = 15
@@ -52,7 +44,7 @@ class UnifiVoucherListRequest(ApiRequest):
     @classmethod
     def create(
         cls
-    ) -> Self:
+    ) -> self:
         """Create voucher list request."""
         return cls(
             method="get",
@@ -73,7 +65,7 @@ def create(
         down_bandwidth: int | None = None,
         byte_quota: int | None = None,
         note: str | None = None,
-    ) -> Self:
+    ) -> self:
         """
         Create voucher create request.
 
@@ -214,6 +206,9 @@ async def check_api_user(
             )
             raise UnifiVoucherApiAuthenticationError from err
         except aiounifi.AiounifiException as err:
-            LOGGER.exception("Unknown UniFi Network communication error occurred: %s", err)
+            LOGGER.exception(
+                "Unknown UniFi Network communication error occurred: %s",
+                err,
+            )
             raise UnifiVoucherApiError from err
         return False
diff --git a/custom_components/unifi_voucher/config_flow.py b/custom_components/unifi_voucher/config_flow.py
index bfcc24e..c47a4fe 100644
--- a/custom_components/unifi_voucher/config_flow.py
+++ b/custom_components/unifi_voucher/config_flow.py
@@ -1,9 +1,6 @@
 """Adds config flow for UniFi Hotspot Manager."""
 from __future__ import annotations
 
-from aiounifi.interfaces.sites import Sites
-from aiounifi.models.site import Site
-
 from homeassistant.core import (
     callback,
     HomeAssistant,
diff --git a/custom_components/unifi_voucher/coordinator.py b/custom_components/unifi_voucher/coordinator.py
index aa1c687..8f5c1c9 100644
--- a/custom_components/unifi_voucher/coordinator.py
+++ b/custom_components/unifi_voucher/coordinator.py
@@ -10,8 +10,6 @@
     CONF_PORT,
     CONF_USERNAME,
     CONF_VERIFY_SSL,
-    ATTR_STATE,
-    ATTR_TEMPERATURE,
 )
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.helpers.update_coordinator import (