Revolut Technologies Inc., the U.K.-based challenger bank, has added American Express to its Open Banking capabilities, which will now allow its U.K.-based mobile banking customers to see card balances and transaction history directly through the Revolut app, according to a press release.

The technology was developed in conjunction with TruLayer, which provides the application program interface that allows the integration of various accounts.

Without the open banking capabilities, American Express cardholders would have to go into the American Express app directly to view balance and transaction history. Revolut is planning to expand the open banking capability to other countries and add additional credit cards.