Basic Card Payment, published by the W3C Web Payments Working Group, defines supportedNetworks as a sequence of identifiers for card networks accepted by the merchant. User agent support for identifiers will likely change over time, and perhaps more rapidly than the custom for W3C to update its Recommendations. This is the Working Group's list of approved card network identifiers.

We are moving the text to Card Network Identifiers Approved for use with Payment Request API.