There is no information regarding the company that will process the transactions made using the Apple-Goldman Sachs credit card. However, Apple’s old ties with Visa indicate that the California-based company might eventually be selected over rivals such as Master Card and Discover Financial Services.
Apple's services business is credited for smoothing out concerns about seasonality in iPhone, Mac, and iPad sales. Apple doesn't share Apple Pay's contribution to that figure, but any revenue generated from a credit card would be included.
Source : https://beebom.com/apple-pay-credit-card-could-be-launched-in-the-us-soon/