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¡¡¡¡public interface PaymentGateway {

¡¡¡¡// ¶¨ÒåÖ§¸¶½Ó¿Ú·½·¨

¡¡¡¡public boolean processPayment(double amount, String cardNumber, String expirationDate, int cvv);

¡¡¡¡}

¡¡¡¡```

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