---
name: paystack-inline-server-verify
description: Use when pairing Paystack Inline checkout with backend transaction initialization and server-side verification for secure Paystack transactions.
license: MIT
compatibility: "Modern browsers with Paystack Popup; package tooling/SSR builds require Node.js >=22.0.0; ESM package; client-side checkout with server verification."
---

# Paystack Inline Server Initialize and Verify

The safest Inline flow initializes the transaction on your backend, sends `access_code` to the browser, and verifies the transaction on the backend after checkout succeeds.

## Backend initialization

Use a server SDK or direct Paystack API call with your secret key.

```ts
async function initializePayment() {
  const result = await paystack.transaction_initialize({
    body: {
      email: customer.email,
      amount: 500000,
      reference: payment.reference,
    },
  });

  const initialized = result.unwrap();
  return { accessCode: initialized.access_code };
}
```

## Frontend resume

```ts
const PaystackPop = await loadPaystack();
const popup = new PaystackPop();

popup.resumeTransaction(accessCode, {
  onSuccess: ({ reference }) => verifyOnServer(reference),
});
```

## Backend verification

After success, call transaction verify on the backend before fulfilling value.

```ts
const verified = await paystack.transaction_verify({
  params: { path: { reference } },
});

const data = verified.unwrap();
```

## Best practices

- Never deliver value based only on `onSuccess`.
- Store your own payment attempt before initializing Paystack.
- Compare amount, currency, reference, and customer before fulfillment.
- Make verification and fulfillment idempotent.