Log in to the Merchant Portal and navigate to the Online Payments section. Here you will find your API key and secret for both sandbox and production environments. Keep your secret key secure and never expose it in client-side code. Each store in your account can have its own set of credentials.

Add the miaPOS JavaScript SDK to your checkout page, or integrate directly via the REST API from your backend. The SDK handles QR code rendering, payment status polling, and callback notifications. For custom integrations, the API provides endpoints for creating payment sessions, checking status, and processing refunds.

Use the sandbox environment to test your integration without processing real money. The sandbox simulates the full payment flow including QR generation, customer scan, and payment confirmation callbacks. Verify that your webhook handler correctly processes success and failure notifications before going live.

Once testing is complete, switch your API credentials from sandbox to production in the Merchant Portal. Update your configuration to use the production endpoint. No code changes are needed if you followed the SDK documentation -- just swap the keys and base URL.

Your online store is now live with miaPOS payments. Customers see a QR code at checkout, scan it with their banking app, and confirm the payment. You receive a real-time webhook notification, and the transaction appears in your Merchant Portal with full details. Monitor your online operations from the dedicated dashboard section.