Embodiments of the invention provide for methods, apparatuses, and computer program products for providing a financial institution check-out system for processing online transactions using a customer's pre-existing online financial institution profile. A customer desiring to checkout from an online vendor's electronic marketplace is given a choice to checkout using a financial institution's secure checkout widget, which is rendered alongside the customer computer system's web browser application by a financial institution server. The widget authenticates the customer as a financial institution account owner, and the financial institution server displays to the customer his or her available payment accounts and receives customer input regarding the desired payment account. The server runs a payment service engine that controls payment for the transaction, and then the widget communicates proof of successful payment to the vendor server. The vendor server receives payment confirmation from the financial institution server and thereafter communicates successful payment confirmation to the customer via the vendor's checkout interface.
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