// 确保变量在全局作用域或传递给 PayPal 的上下文中
window.paypalOrderData = {
  amount: '10.00',
  currency: 'USD'
};

paypal.Buttons({
  createOrder: function(data, actions) {
    return actions.order.create({
      purchase_units: [{
        amount: {
          value: window.paypalOrderData.amount,
          currency_code: window.paypalOrderData.currency
        }
      }]
    });
  }
}).render('#paypal-button-container');

// 使用回调或 Promise 确保 PayPal 加载完成
function initPayPalButton() {
  paypal.Buttons({
    createOrder: function(data, actions) {
      return actions.order.create({
        purchase_units: [{
          amount: {
            value: '10.00',
            currency_code: 'USD'
          }
        }]
      });
    }
  }).render('#paypal-button-container');
}

// 动态加载 PayPal SDK
function loadPayPalSDK(callback) {
  const script = document.createElement('script');
  script.src = 'https://www.paypal.com/sdk/js?client-id=YOUR_CLIENT_ID';
  script.onload = callback;
  document.body.appendChild(script);
}

loadPayPalSDK(initPayPalButton);

// 从服务器获取数据后初始化 PayPal 按钮
fetch('/api/get-payment-details')
  .then(response => response.json())
  .then(data => {
    paypal.Buttons({
      createOrder: function(data, actions) {
        return actions.order.create({
          purchase_units: [{
            amount: {
              value: data.amount,
              currency_code: data.currency
            },
            description: data.description
          }]
        });
      }
    }).render('#paypal-button-container');
  });

{
  "purchase_units": [{
    "amount": {
      "currency_code": "USD",  // 必须使用有效货币代码
      "value": "100.00"       // 必须为字符串格式
    },
    "items": [{
      "name": "Product Name",
      "quantity": "1",        // 数量也需为字符串
      "unit_amount": {
        "currency_code": "USD",
        "value": "100.00"
      }
    }]
  }]
}