Integrating Paystack into a Next.js App: A Production Checklist

Paystack's docs get you to a working demo fast. They don't tell you what breaks in production. This is the checklist I wish I'd had — the parts that separate a payment integration that survives real traffic from one that silently loses orders.

1. Never trust the frontend callback

The browser redirect after payment is a hint, not proof. Users close tabs, lose connection, or refresh at the wrong moment. Verify every transaction server-side by calling Paystack's verify endpoint with the reference before you grant anything of value. The frontend saying "success" means nothing until your server confirms it.

2. Webhooks are your source of truth

Set up a webhook endpoint and treat it as the authoritative record of what happened. Two non-negotiables:

• Verify the signature. Paystack signs every webhook with your secret key. Recompute the HMAC and reject anything that doesn't match — otherwise anyone can POST fake "payment succeeded" events to your endpoint.
• Make it idempotent. Webhooks can fire more than once for the same event. Key your processing on the transaction reference so a duplicate delivery doesn't double-credit an account.

3. Reconcile, don't assume

Build a job that periodically reconciles your records against Paystack's. Network blips happen; a webhook occasionally never arrives. A nightly reconciliation catches the orders that fell through the cracks before a customer emails you about them.

4. Model fees explicitly

Decide who pays the processing fee and compute it in one place. If you're running a marketplace, your platform fee, the processor fee, and any minimums need to be a single, testable function — not arithmetic sprinkled across five files.

5. Plan for payouts separately

Collecting money and sending money are different problems. If you need to pay out to users or vendors, that's a separate flow with its own provider considerations, float management, and failure modes. Don't assume the collection integration covers it.

6. Log everything, expose nothing

Every state change — initialized, charged, verified, failed — should be logged with its reference. But never expose secret keys to the client, and never store card data yourself. Let Paystack handle the sensitive parts.

The short version

Treat the frontend as untrusted, the webhook as truth, and reconciliation as your safety net. Do those three things and a Paystack integration becomes boring — which, for payments, is exactly what you want.

Building something on Paystack and want it done right the first time? Let's talk.