Methods and systems of using sub-domains to federate device credentials scoped to a common domain

A computer-implemented method of authenticating a user device via a device credential scoped to a common domain shared among a plurality of payment networks, each payment network having a respective domain name different than the common domain and each payment network being assigned with a respective sub-domain of the common domain, the method comprising:

• receiving, by a server of a payment network of the plurality of payment networks, a first request redirected from a sub-domain assigned to the payment network to a domain name associated with the payment network;
• responsive to the first request, transmitting, by the server to the user device, an authentication request comprising a challenge, a user identifier that identifies a user, and the common domain to which the device credential is scoped;
• receiving, by the server from the user device, a response;
• accessing, by the server, the device credential, the device credential having been stored by the payment network, the payment network being assigned with the sub-domain of the common domain to share the scope with other ones of the plurality of payment networks;
• validating, by the server, the response based on the device credential;
• and
• causing, by the server, the user identifier and the device credential to be federated to the other ones of the plurality of payment networks based on the validating.