A data processing system comprises a print-enabled identity server. The print-enabled identity server comprises an identity provider operative in a federated identity system that authenticates a user, and stores profile information and payment information. The print-enabled identity server further comprises a Federated Print Search Responder (FPSR) and a discovery service hosted by the identity provider that operate in combination to answer client print-search queries for finding at least one remote printer according to client-designated criteria. An identity-based payment service manages user payment transactions.