Payment Request API：原生支付界面与兼容策略

概述Payment Request API 提供原生结算界面与支付方式抽象，支持根据用户选择动态更新价格与运费，减少表单步骤与输入负担。用法/示例const methods = [{ supportedMethods: 'basic-card' }] const details = { total: { label: '总计', amount: { currency: 'CNY', value: '199.00' } }, displayItems: [{ label: '商品A', amount: { currency: 'CNY', value: '199.00' } }] } const opts = { requestPayerEmail: true, requestShipping: true } const req = new PaymentRequest(methods, details, opts) req.addEventListener('paymentmethodchange', e => { const newDetails = { ...details, total: { label: '总计', amount: { currency: 'CNY', value: '189.00' } } } e.updateWith(newDetails) }) const resp = await req.show() await sendToServer(resp) await resp.complete('success') 工程建议明确支持的支付方式与地区策略；对不支持环境回退到传统表单与第三方 SDK。校验返回的支付令牌与收货信息；遵守 PCI 与隐私合规。为动态金额更新提供一致的后端校验，避免价格不同步与欺诈。参考与验证MDN：Payment Request API — https://developer.mozilla.org/docs/Web/API/Payment_Request_APIW3C：Payment Request — https://www.w3.org/TR/payment-request/