feat: add pay demo api

src/api/pay/demo/index.ts

@@ -0,0 +1,21 @@
+import { defHttp } from '@/utils/http/axios'
+
+// 获得示例订单分页
+export function getDemoOrderPage(params) {
+  return defHttp.get({ url: '/pay/demo-order/page', params })
+}
+
+// 获得示例订单
+export function getDemoOrder(id: number) {
+  return defHttp.get({ url: '/pay/demo-order/get?id=' + id })
+}
+
+// 创建示例订单
+export function createDemoOrder(data) {
+  return defHttp.post({ url: '/pay/demo-order/create', data })
+}
+
+// 退款示例订单
+export function updateApp(id: number) {
+  return defHttp.put({ url: '/pay/demo-order/refund?id=' + id })
+}

src/views/pay/demo/index.vue

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+<template>
+  <div>开发中</div>
+</template>