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// 假设有一个PaymentGateway接口
interface PaymentGateway {
    public function charge($amount);
}

// 实现不同的支付网关
class CreditCardPayment implements PaymentGateway {
    public function charge($amount) {
        // 处理信用卡支付逻辑
    }
}

class PayPalPayment implements PaymentGateway {
    public function charge($amount) {
        // 处理PayPal支付逻辑
    }
}

// 在控制器中使用
class CheckoutController extends Controller {
    public function processPayment(Request $request) {
        $amount = $request->input('amount');
        $paymentMethod = $request->input('payment_method');

        $gateway = null;
        if ($paymentMethod === 'credit_card') {
            $gateway = new CreditCardPayment();
        } elseif ($paymentMethod === 'paypal') {
            $gateway = new PayPalPayment();
        }

        if ($gateway) {
            $gateway->charge($amount);
            return response()->json(['status' => 'success']);
        } else {
            return response()->json(['status' => 'error', 'message' => 'Invalid payment method']);
        }
    }
}