US Patent 11783332 Method and system for facilitating secure card-based transactions

A method and a system for facilitating secure card-based transactions are provided. A payment network server stores a mapping database that is indicative of a mapping between actual card data of a transaction card and a plurality of proxy datasets that are stored in the transaction card. The payment network server receives a transaction request for a transaction that is initiated by way of the transaction card. Instead of the actual card data, the transaction request includes a first proxy dataset as an identifier to the transaction card. The payment network server accesses the mapping database and retrieves the actual card data mapped to the first proxy dataset. The payment network server then communicates the transaction request having the actual card data to an issuer of the transaction card. The issuer processes the transaction based on the actual card data.