How a single unit of stored value moves from top-up to settlement, with reversals branching off later phases
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Main path
• One horizontal rail carries value from cleared top-up to settled capture
• Each phase is a double-entry event, not a mutable balance field
• Settlement reconciles the wallet ledger to the safeguarding account
Holds and balances
• A hold reserves value and cuts the available balance
• Ledger balance is unchanged until the hold is captured as Spent
• Available = ledger balance minus active holds
Reversals and outflows
• Withdrawn moves cleared value out to the user's bank
• Refunded returns captured value to the available balance
• Every reversal is idempotent and keyed to the original event
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