create example

custom_components/temp_station_integration/__init__.py

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+DOMAIN = "temp_station_integration"
+
+async def async_setup(hass, config):
+    return True

custom_components/temp_station_integration/manifest.json

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+{
+  "domain": "temp_station_integration",
+  "name": "Temp Station integration",
+  "version": "0.1",
+  "requirements": [],
+  "codeowners": []
+}

custom_components/temp_station_integration/sensor.py

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+import logging
+import aiohttp
+import async_timeout
+from datetime import timedelta
+from homeassistant.components.sensor import SensorEntity
+from homeassistant.helpers.update_coordinator import (
+    CoordinatorEntity,
+    DataUpdateCoordinator,
+    UpdateFailed,
+)
+
+_LOGGER = logging.getLogger(__name__)
+SCAN_INTERVAL = timedelta(minutes=1)  # refresh every 1 min
+
+API_URL = "https://example.com/api"   # <-- change to your API
+POST_PAYLOAD = {"key": "value"}       # <-- change payload
+JSON_KEY = "result"                   # <-- key to extract
+
+async def async_setup_platform(hass, config, async_add_entities, discovery_info=None):
+    session = aiohttp.ClientSession()
+
+    async def async_update_data():
+        try:
+            with async_timeout.timeout(10):
+                async with session.post(API_URL, json=POST_PAYLOAD) as resp:
+                    if resp.status != 200:
+                        raise UpdateFailed(f"Error {resp.status}")
+                    data = await resp.json()
+                    return data
+        except Exception as err:
+            raise UpdateFailed(f"Error communicating with API: {err}")
+
+    coordinator = DataUpdateCoordinator(
+        hass,
+        _LOGGER,
+        name="my_api_integration",
+        update_method=async_update_data,
+        update_interval=SCAN_INTERVAL,
+    )
+
+    await coordinator.async_config_entry_first_refresh()
+    async_add_entities([MyAPISensor(coordinator)], True)
+
+
+class MyAPISensor(CoordinatorEntity, SensorEntity):
+    def __init__(self, coordinator):
+        super().__init__(coordinator)
+        self._attr_name = "My API Sensor"
+        self._attr_unique_id = "my_api_sensor"
+
+    @property
+    def native_value(self):
+        data = self.coordinator.data
+        if data is None:
+            return None
+        return data.get(JSON_KEY)

main.py

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+# This is a sample Python script.
+
+# Press Shift+F10 to execute it or replace it with your code.
+# Press Double Shift to search everywhere for classes, files, tool windows, actions, and settings.
+
+
+def print_hi(name):
+    # Use a breakpoint in the code line below to debug your script.
+    print(f'Hi, {name}')  # Press Ctrl+F8 to toggle the breakpoint.
+
+
+# Press the green button in the gutter to run the script.
+if __name__ == '__main__':
+    print_hi('PyCharm')
+
+# See PyCharm help at https://www.jetbrains.com/help/pycharm/