i just wanted to play with the energy meter data but the message is Invalid user token why is it so  following is the code 

import json
import requests

# Load the configuration file
with open(r'D:\Notes\7th_Sem\Final_Year_Project\API Iammeter\config.json') as config_file:
config = json.load(config_file)

# API key
api_key = config['API_KEY']


# headers
headers = {
"Authorization": f"Bearer {api_key}"
}

# API request
url = "https://www.iammeter.com/api/v1/site/metersdata"
response = requests.get(url, headers=headers)
data = response.json()
print(data)