Stripe for Indie Developers: Everything I Learned Across 6 Products

Stripe is the best payment processor for indie developers. It's also the one with the steepest learning curve for getting production-right the first time.

Here's everything that took me multiple projects to learn, condensed into one guide.

Start With Payment Links, Not the Full Integration

If you're validating a product idea, don't build a full Stripe integration. Create a payment link in the Stripe Dashboard and use that URL as your buy button.

Payment links handle:

• Checkout UI
• Card processing
• Email receipts
• Failed payment retries

What they don't handle: automatic product delivery, subscription management, user account linking.

For a first product, that's fine. Collect payments manually, deliver manually, validate demand. Then build the automation.

The Webhook Pattern That Actually Works

Every production Stripe integration lives or dies on webhooks. Here's the pattern:

// src/app/api/webhooks/stripe/route.ts
import { NextRequest, NextResponse } from "next/server"
import Stripe from "stripe"
import { db } from "@/lib/db"

const stripe = new Stripe(process.env.STRIPE_SECRET_KEY!)

export async function POST(req: NextRequest) {
  // 1. Read body as TEXT (not JSON -- this breaks signature verification)
  const body = await req.text()
  const sig = req.headers.get("stripe-signature")!

  // 2. Verify the signature
  let event: Stripe.Event
  try {
    event = stripe.webhooks.constructEvent(body, sig, process.env.STRIPE_WEBHOOK_SECRET!)
  } catch {
    return NextResponse.json({ error: "Invalid signature" }, { status: 400 })
  }

  // 3. Check for duplicate (Stripe retries on failure)
  const existing = await db.stripeEvent.findUnique({ where: { id: event.id } })
  if (existing) return NextResponse.json({ received: true })

  // 4. Handle the event
  try {
    await handleEvent(event)
  } catch (err) {
    console.error("Webhook handler failed:", err)
    return NextResponse.json({ error: "Handler failed" }, { status: 500 })
  }

  // 5. Mark as processed
  await db.stripeEvent.create({ data: { id: event.id, type: event.type } })
  return NextResponse.json({ received: true })
}

The events you actually need to handle:

async function handleEvent(event: Stripe.Event) {
  switch (event.type) {
    case "checkout.session.completed":
      await handleCheckoutComplete(event.data.object as Stripe.Checkout.Session)
      break
    case "customer.subscription.created":
    case "customer.subscription.updated":
      await handleSubscriptionUpdate(event.data.object as Stripe.Subscription)
      break
    case "customer.subscription.deleted":
      await handleSubscriptionCanceled(event.data.object as Stripe.Subscription)
      break
    case "invoice.payment_failed":
      await handlePaymentFailed(event.data.object as Stripe.Invoice)
      break
    default:
      // Return 200 for events you don't handle -- don't return 4xx
      break
  }
}

One-Time Payments vs Subscriptions

One-time payments (Checkout with mode: "payment"):

• Simpler to implement
• No renewal logic needed
• Customer owns the product forever
• Use for: digital downloads, templates, one-time tools

Subscriptions (Checkout with mode: "subscription"):

• Recurring revenue
• Must handle: trial periods, dunning (failed payment recovery), cancellation, upgrades/downgrades
• Use for: SaaS with ongoing value, monthly access

For a first product: start with one-time payments. The implementation is half the complexity.

Pricing That Converts

What works for indie developer tools:

• Under $50: Impulse buy. No approval needed. Single digit conversion rate.
• $50-$200: Considered purchase. Needs clear ROI case. 1-3% conversion.
• $200+: Requires trust + clear ROI + possibly a demo.

For subscription products, annual plans convert better than monthly after you have social proof. Offer annual at 2 months free (17% discount) -- it's the standard.

The Customer Portal (Free in Stripe)

Don't build your own subscription management UI. Use Stripe's hosted customer portal.

// Create a portal session when user clicks "Manage Billing"
const portalSession = await stripe.billingPortal.sessions.create({
  customer: user.stripeCustomerId,
  return_url: `${process.env.NEXTAUTH_URL}/dashboard`,
})

redirect(portalSession.url)

The portal handles: view invoices, update payment method, cancel subscription, download receipts. Zero code on your end.

Handling Failed Payments (Dunning)

Stripe's Smart Retries handle most failed payments automatically. You need to handle what happens after all retries fail.

async function handlePaymentFailed(invoice: Stripe.Invoice) {
  const customerId = invoice.customer as string
  const user = await db.user.findUnique({
    where: { stripeCustomerId: customerId }
  })

  if (!user) return

  // Send payment failed email
  await sendEmail({
    to: user.email,
    subject: "Your payment failed",
    body: `Your payment for ${invoice.amount_due / 100} ${invoice.currency.toUpperCase()} failed. 
    Please update your payment method: ${process.env.NEXTAUTH_URL}/billing`,
  })

  // Optionally: downgrade to free tier after grace period
  // Don't immediately cut off access -- give them a chance to fix it
}

Testing Webhooks Locally

Use the Stripe CLI to forward webhooks to localhost:

# Install Stripe CLI
brew install stripe/stripe-cli/stripe

# Forward to your local server
stripe listen --forward-to localhost:3000/api/webhooks/stripe

# In another terminal, trigger test events
stripe trigger payment_intent.succeeded
stripe trigger customer.subscription.created

This gives you a local webhook secret (whsec_...) for development.

Common Mistakes

Not handling webhook retries: Stripe retries failed webhooks for 72 hours. If you don't deduplicate by event.id, you'll process payments multiple times.

Reading body as JSON before signature check: The JSON parser can normalize whitespace, breaking the HMAC verification. Always await req.text() first.

Hardcoding price IDs: Store them in environment variables. You'll have test and production price IDs, and they change when you update pricing.

Not testing cancellation: Test the full cancel flow before launch. The customer.subscription.deleted event fires immediately on cancel -- make sure you don't cut access before the period end.

// Check period end, not subscription status
const hasAccess = user.stripeCurrentPeriodEnd
  ? user.stripeCurrentPeriodEnd > new Date()
  : false

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This full Stripe setup -- checkout, webhooks, customer portal, subscription management -- is pre-wired in the AI SaaS Starter Kit.

AI SaaS Starter Kit ($99) ->

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