Python requests library returns 401 Unauthorized when calling my API

The API works successfully in Postman, but the same request from Python returns 401 Unauthorized. I am passing the bearer token in the request headers.

import requests

url = "https://api.example.com/customers"

headers = { "Authorization": "Bearer my-token", "Content-Type": "application/json" }

response = requests.get(url, headers=headers)

print(response.status_code) print(response.text)

=================================================================== Error 401 Unauthorized