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class PaymentProcessor {
  constructor(apiKey) {
    this.apiKey = apiKey;
    this.transactions = [];
    this.taxRate = 0.08;
  }
  processPayment(amount, currency = 'USD') {
    if (!this.validateAmount(amount)) throw new Error('Invalid payment amount');
    const tax = amount * this.taxRate;
    const total = amount + tax;
    const payment = {
      id: this.generateId(),
      amount,
      currency,
      tax,
      total,
      status: 'pending',
      timestamp: new Date()
    };
    this.transactions.push(payment);
    return this.sendToGateway(payment);
  }
  validateAmount(amount) {
    return typeof amount === 'number' && amount > 0;
  }
  generateId() {
    return 'txn_' + Math.random().toString(36).substr(2, 9);
  }
  async sendToGateway(payment) {
    return new Promise(r => setTimeout(() => {
      payment.status = 'completed';
      r(payment);
    }, 1000));
  }
}