import requests

url = 'https://api.simplex.sh/close_session'
headers = {
    'X-API-Key': 'your_api_key_here'
}
data = {
    'session_id': 'your_session_id'
}

response = requests.post(url, headers=headers, data=data)
print(response.json())

{
  "succeeded": true
}