diff --git a/custom_components/dkncloudna/.gitkeep b/custom_components/dkncloudna/.gitkeep
deleted file mode 100644
index e69de29..0000000
diff --git a/custom_components/dkncloudna/__init__.py b/custom_components/dkncloudna/__init__.py
new file mode 100644
index 0000000..cd835da
--- /dev/null
+++ b/custom_components/dkncloudna/__init__.py
@@ -0,0 +1,70 @@
+"""DKN Cloud NA integration for Home Assistant."""
+
+from __future__ import annotations
+
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.const import Platform
+from homeassistant.core import HomeAssistant
+from homeassistant.exceptions import ConfigEntryAuthFailed
+from homeassistant.helpers.aiohttp_client import async_get_clientsession
+
+from .api import DknCloudNaClient
+from .const import CONF_REFRESH_TOKEN, CONF_USER_TOKEN, DOMAIN, LOGGER
+from .coordinator import DknCoordinator
+
+PLATFORMS: list[Platform] = [
+    Platform.CLIMATE,
+    Platform.SENSOR,
+    Platform.BINARY_SENSOR,
+]
+
+
+async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
+    """Set up DKN Cloud NA from a config entry."""
+    hass.data.setdefault(DOMAIN, {})
+
+    token = entry.options.get(CONF_USER_TOKEN)
+    if not token:
+        raise ConfigEntryAuthFailed("No token in options; reauthentication required")
+
+    username = entry.data.get("username", "")
+    refresh_token = entry.options.get(CONF_REFRESH_TOKEN)
+    session = async_get_clientsession(hass)
+
+    client = DknCloudNaClient(
+        username,
+        session,
+        token=token,
+        refresh_token=refresh_token,
+    )
+
+    coordinator = DknCoordinator(hass, entry, client)
+    await coordinator.async_config_entry_first_refresh()
+
+    hass.data[DOMAIN][entry.entry_id] = {
+        "coordinator": coordinator,
+        "client": client,
+    }
+
+    await hass.config_entries.async_forward_entry_setups(entry, PLATFORMS)
+    entry.async_on_unload(entry.add_update_listener(_async_reload_entry))
+
+    LOGGER.info(
+        "DKN Cloud NA set up (entry=%s, scan_interval=%ss)",
+        entry.entry_id,
+        coordinator.update_interval.total_seconds() if coordinator.update_interval else "?",
+    )
+    return True
+
+
+async def async_unload_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
+    """Unload a config entry."""
+    unload_ok = await hass.config_entries.async_unload_platforms(entry, PLATFORMS)
+    if unload_ok:
+        hass.data[DOMAIN].pop(entry.entry_id, None)
+    return unload_ok
+
+
+async def _async_reload_entry(hass: HomeAssistant, entry: ConfigEntry) -> None:
+    """Reload entry when options change."""
+    await hass.config_entries.async_reload(entry.entry_id)