Discord OAuth2 Flask-Discord

from flask import Flask, redirect, url_for, render_template
from flask_discord import DiscordOAuth2Session, requires_authorization, Unauthorized
import os

os.environ["OAUTHLIB_INSECURE_TRANSPORT"] = "1"

app = Flask(__name__)
app.secret_key = 'YOUR-APP-SECRET'

app.config["DISCORD_CLIENT_ID"] = 0123456789
app.config["DISCORD_CLIENT_SECRET"] = 'YOUR-CLIENT-SECRET'
app.config["DISCORD_REDIRECT_URI"] = 'http://localhost:5000/callback'

discord = DiscordOAuth2Session(app)


@app.route('/')
def home():
    return render_template('home.html')


@app.route('/login')
def login():
    return discord.create_session(scope=["identify", "email"])


@app.route('/callback')
def callback():
    discord.callback()
    return redirect(url_for("dashboard"))


@app.route('/dashboard')
@requires_authorization
def dashboard():
    user = discord.fetch_user()
    return render_template('dash.html', user=user)


@app.errorhandler(Unauthorized)
def redirect_unauthorized(e):
    return redirect(url_for("login"))


if __name__ == "__main__":
    app.run(debug=True)