Dear All, Hope this email finds you well. I am facing a error koha rest api , I explained below - I use the below code base for the koha rest api . When I check the bywater koha demo site's rest api, it's working fine but When I checked my demo koha site, getting authentication error(401) I entered the correct client id and secret ssl certificate installed correctly. My api worked properly using the chrome RESTer tool. Thanks in advance . import requests import json import os from requests.structures import CaseInsensitiveDict import http.client conn = http.client.HTTPSConnection("http://123.49.46.157:8080/") #from dotenv import load_dotenv #load_dotenv() data = { "client_id": "e877bce0-78bc-4d39-a0c1-2df7fccb1397", "client_secret": "461cda1a-665d-4d24-a0e0-dace5f83a1f4", "grant_type": "client_credentials", } response = requests.post("http://123.49.46.157:8080/api/v1/oauth/token", data=data) credentials = response.json() print(credentials) access_token = credentials['access_token'] print("Access_token: ",access_token) #auth2 = CaseInsensitiveDict() auth2={"content-type":"application/json","authorization": f"Bearer {access_token}"} print(auth2) response = requests.request("GET", "http://123.49.46.157:8080/api/v1/patrons", headers=auth2 ) print(response) Regrads, Esharat Mia