get mpesa access token function

mpesa_handler.py

def get_mpesa_access_token(self):
    try:
        res = requests.get(
            self.access_token_url,
            auth=HTTPBasicAuth(self.consumer_key, self.consumer_secret),
        )
        token = res.json()['access_token']

        self.headers = {
            "Authorization": f"Bearer {token}",
            "Content-Type": "application/json"
        }
    except Exception as e:
        print(str(e), "error getting access token")
        raise e

    return token