Network failures happen. A user might click "Pay" twice, or the API might time out while waiting for a response. Without safeguards, this leads to double-charging.
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Have you built a payment or wallet system before? What was your biggest technical challenge? Let me know in the comments. Network failures happen
# 2. Check for sufficient funds if sender.current_balance < amount: raise InsufficientFundsError("Balance too low") biometric authentication (facial scans or fingerprints)
Registration, biometric authentication (facial scans or fingerprints), and card management.
def pay(self, amount, recipient_wallet): if amount <= 0: return "Amount must be positive" if self.balance < amount: return "Insufficient balance"
Requiring multiple verification methods—such as a PIN combined with biometrics—to access funds.
