How to Add Payments (Stripe) to Your SaaS in a Weekend

#webdev #ai #programming

Most SaaS founders delay payments.
They say things like:
“I’ll add Stripe later”
“Let’s finish the product first”
“I need more features before charging”
That’s a mistake.
👉 If your product can’t make money, nothing else matters.
The good news?
You can add payments to your SaaS in a single weekend.
Here’s exactly how.

Step 1: Decide How You’ll Charge

Before writing any code, define your monetization model.
Keep it simple.
The 3 easiest options:

Subscriptions (monthly/yearly)
One-time payments
Credits system
If you’re building an AI SaaS, credits work really well.
For example, in Prodly AI, users:
Buy credits
Generate product descriptions
Come back when they need more
👉 Simple, predictable, scalable.

Step 2: Create Your Stripe Account

Go to Stripe and set up:

Account
Business info
Bank details
Then grab your:
API keys
Webhook secret You’ll need them for integration.

Step 3: Install Stripe in Your Project

If you're using Next.js:
npm install stripe

Create a simple Stripe client:

import Stripe from "stripe";

export const stripe = new Stripe(process.env.STRIPE_SECRET_KEY!, {
  apiVersion: "2023-10-16",
});

That’s your foundation.

Step 4: Create a Checkout Session

This is the fastest way to start accepting payments.
Example API route:

import { stripe } from "@/lib/stripe";

export async function POST() {
  const session = await stripe.checkout.sessions.create({
    payment_method_types: ["card"],
    mode: "payment",
    line_items: [
      {
        price_data: {
          currency: "usd",
          product_data: {
            name: "Pro Plan",
          },
          unit_amount: 9900,
        },
        quantity: 1,
      },
    ],
    success_url: "https://yourapp.com/success",
    cancel_url: "https://yourapp.com/cancel",
  });

  return Response.json({ url: session.url });
}

Redirect the user → done.

Step 5: Handle Webhooks (Important)

Stripe will notify your app when payment succeeds.
You need this to:
Activate user access
Add credits
Unlock features
Basic idea:

if (event.type === "checkout.session.completed") {
  // grant access or credits
}

Don’t skip this step.

Step 6: Connect Payments to Your Product Logic

This is where real SaaS begins.
After payment:
Upgrade user plan
Add credits
Unlock features
For example:
In Prodly AI:
👉 Payment → Credits → Usage
In a directory SaaS like Dirly:
👉 Payment → Featured listing → Visibility
That’s how you tie money directly to value.

Live Demo

Step 7: Test Everything

Before going live:

Use Stripe test mode
Simulate payments
Check webhooks
Verify user access
Don’t rush this part.
Broken payments = lost trust.

Step 8: Go Live (Fast)

Once it works:
👉 Switch to live keys
👉 Start charging
No need for:

Perfect UI
Complex billing logic
10 pricing tiers
Start simple.

What Most People Get Wrong
They think payments are:
Complicated
Risky
Something to “add later”
In reality:
👉 Payments are just another feature
And one of the most important ones.

The Faster Way

If you don’t want to build everything yourself, you don’t have to.
Modern SaaS scripts already include:
Stripe integration
Pricing logic
User access control
For example:
Prodly AI comes with a built-in credit system + Stripe
Dirly includes monetization via paid listings and ads
👉 So instead of spending a weekend building payments…
You can spend it launching.