idempotency_pattern.py

import uuid

class PaymentProcessor:
    def __init__(self):
        self.processed_requests = set()

    def process_payment(self, payment_id, amount):
        if payment_id in self.processed_requests:
            return {"status": "already_processed"}
        else:
            self.processed_requests.add(payment_id)
            # Process the payment (pseudo-code)
            # charge_credit_card(amount)
            return {"status": "success"}

# Example usage
processor = PaymentProcessor()
payment_id = str(uuid.uuid4())

result1 = processor.process_payment(payment_id, 100)
result2 = processor.process_payment(payment_id, 100)

print(result1)  # {"status": "success"}
print(result2)  # {"status": "already_processed"}