Abstract: This invention outlines a unique method and system where multiple accounts can be combined and user can access them from a single master account. Account holder or organization offering master account can define rule(s) maintained in a configurable table. Those rules dictate how a single transaction made to the master account can be executed using the combination of master account and child account(s). This technique enables a user to manage multiple accounts using a master account and an ATM/Debit/Credit card associated with the master account making universal card concept a reality. Such card is just like a regular card compatible with existing systems and usable wherever regular cards can be used without any added difficulties. This also disclose a technique to encode decode a sequence of transaction originated within a time segment to retrieve extra information that can be associated with the account.