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// auth setup...
import passport from "passport";
import { Strategy as GoogleStrategy } from "passport-google-oauth20";
app.use(session({ store: new RedisStore({ client: redis }) }));
passport.use(new GoogleStrategy({ clientID, clientSecret, callbackURL },
  async (token, tokenSecret, profile, done) => {
    const user = await db.query("SELECT * FROM auth_users WHERE...");
    // ... 40 more lines of session handling
  }));
// billing setup...
import Stripe from "stripe";
const stripe = new Stripe(process.env.STRIPE_SECRET_KEY);
app.post("/webhooks/stripe", express.raw({ type: "application/json" }),
  async (req, res) => {
    const sig = req.headers["stripe-signature"];
    // ... 30 more lines of webhook verification
  });
// email setup...
import nodemailer from "nodemailer";
const transporter = nodemailer.createTransport({
  host: process.env.SMTP_HOST,
  // ... 20 more lines of template loading
});
// job queue setup...
import Bull from "bull";
const emailQueue = new Bull("email", { redis: { ... } });
// ... and this goes on for 200+ lines