Stored-Value and E-Money Wallet Ledgers
Designing a closed-loop wallet from the ledger up: double-entry balances, the money lifecycle, safeguarding client funds 1:1, and the engineering that keeps top-ups, holds, and reconciliation honest.
Designing a closed-loop wallet: top-up, hold, spend, refund, safeguarding of e-money, and the double-entry ledger behind a balance.