A system and method process an electronic commerce transaction between a consumer and a merchant over a communications network. A checkout webpage of a virtual shopping cart of the merchant is displayed by a consumer device and an initialization routine of the checkout webpage is performed by the consumer device. The initialization routine segments the checkout webpage to display a widget webpage of a service provider within the checkout webpage. Content of the widget webpage is loaded and displayed independent of content of the checkout webpage. A bootstrap routine of the widget webpage is performed by the consumer device to add a payment widget to the widget webpage and to display the payment widget with the checkout webpage. Further, the transaction is processed by the consumer device to completion using the payment widget.