import requests

url = "https://api.rebase.energy/platform/v2/sites"

payload = {
    "name": "My site",
    "latitude": 52.5,
    "longitude": 13.4,
    "settings": {
        "model_resolution": "1h",
        "additional_points": [],
        "trainLongTermModels": True,
        "trainNearTermModels": True,
        "usePhysicalModels": True,
        "weather_models": [],
        "create_params": {}
    },
    "type": "solar",
    "assets": [
        {
            "azimuth": 180,
            "tilt": 30,
            "capacity": 1000,
            "install_date": "2020-01-01"
        }
    ]
}
headers = {
    "Authorization": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

{
  "errors": [
    {
      "field": "<string>",
      "message": "<string>"
    }
  ]
}