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yarn add medusa-payment-paystack

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module.exports = defineConfig({
  projectConfig: {
    databaseUrl: process.env.DATABASE_URL,
    // ... other config
  },
  modules: [
    // other modules
    {
      resolve: "@medusajs/medusa/payment",
      options: {
        providers: [
          // other payment providers like stripe, paypal etc
          {
            resolve: "medusa-payment-paystack",
            options: {
              secret_key: <PAYSTACK_SECRET_KEY>,
            } satisfies import("medusa-payment-paystack").PluginOptions,
          },
        ],
      },
    },
  ],
});

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await initiatePaymentSession(cart, {
  provider_id: selectedPaymentMethod,
  context: {
    email: cart.email,
  },
});

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const { paystackTxAccessCode } = paymentSession.data;

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import Paystack from "@paystack/inline-js"

const PaystackPaymentButton = ({
  session,
  notReady,
}: {
  session: HttpTypes.StorePaymentSession | undefined
  notReady: boolean
}) => {
  const paystackRef = useRef<Paystack | null>(null)

  // If the session is not ready, we don't want to render the button
  if (notReady || !session) return null

  // Get the accessCode added to the session data by the Paystack plugin
  const accessCode = session.data.paystackTxAccessCode
  if (!accessCode) throw new Error("Transaction access code is not defined")

  return (
    <button
      onClick={() => {
        if (!paystackRef.current) {
          paystackRef.current = new Paystack()
        }

        const paystack = paystackRef.current

        paystack.resumeTransaction(accessCode, {
          async onSuccess() {
            // Call Medusa checkout complete here
            await placeOrder()
          },
          onError(error: unknown) {
            // Handle error
          },
        })
      }}
    >
      Pay with Paystack
    </button>
  )
}

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const { paystackTxAuthorizationUrl } = session.data;

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// Redirect the customer to Paystack's hosted payment page
window.open(paystackTxAuthorizationUrl, "_self");