Close the Checkout widget

Once the checkout process is finished, the customer will be prompted with a message screen according to the final state. In such a screen (still inside the Checkout widget), the customer will be able to close the widget —which will trigger the client-side callback .onClose(), defined when opening the Checkout widget—, and you (the merchant) will take over and redirect the customer to the corresponding page in your site, depending on the Order's final status.