Testing

Make sure your integration behaves correctly — creating a Payment Intent, loading the widget, and handling the result — before you rely on it in production.

Note

Coming soon: a dedicated test mode with sandbox keys and test cards, so you can simulate payments without moving real money. Until then, use the checks below to validate your integration logic.

What to check

Your server creates a Payment Intent and receives a client_secret.
The widget loads on your domain and accepts the client_secret.
You correctly handle the success and error messages from the widget.
You resize the iframe in response to resize messages.
The customer sees the 3-D Secure prompt when their bank requires one, and the flow completes either way.

Discount codes

If you use coupons on a hosted checkout page, enter a code and confirm the total updates correctly before payment. Manage your codes per product in Products & pricing.

Going live

Once your integration handles the full flow cleanly, you're ready to take real payments. Keep your secret key server-side and monitor your first live transactions from your dashboard.