Basic setup that I personally use for discord authentication.

.env

CLIENT_ID = 
AUTH_URL = 
CLIENT_SECRET = 
REDIRECT_URI = 

const.py

import os
import dotenv

dotenv.load_dotenv()

CLIENT_ID = int(os.getenv("CLIENT_ID"))
AUTH_URL = os.getenv("AUTH_URL")
CLIENT_SECRET = os.getenv("CLIENT_SECRET")
REDIRECT_URI = os.getenv("REDIRECT_URI")

API_URL = "https://discord.com/api/v10/"

main.py

import const
import requests

def exchange_code(code : str):
    """
    where `code` is the code that you get after logging your discord account via `AUTH_URL`
    """
    data = {
        "client_id" : const.CLIENT_ID,
        "client_secret" : const.CLIENT_SECRET,
        "grant_type" : "authorization_code",
        "code" : code,
        "redirect_uri" : const.REDIRECT_URI,
        "scope" : "identify email guilds guilds.join"
    }

    headers = {
        "Conent-Type" : "application/x-www-form-urlencoded"
    }
    credentials =  requests.post(
        url = "https://discord.com/api/oauth2/token",
        data = data,
        headers=headers
    ).json()

    access_token = credentials["access_token"]
    # print(access_token)

    return requests.get(
        url = f"{const.API_URL}users/@me",
        headers={'Authorization' : f'Bearer {access_token}'}
    ).json()