Internal ledger, not bank transfer

Alice pays Bob → PayPal debits Alice's balance, credits Bob's. No bank transaction. Real-time. Free (for P2P).

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Internal ledger, not bank transfer

Alice pays Bob → PayPal debits Alice's balance, credits Bob's. No bank transaction. Real-time. Free (for P2P).

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Double-entry bookkeeping

Every P2P is atomic: debit A, credit B, in one transaction. ACID. Never lose or duplicate money.