diff --git a/docs/AppDocs/usesdk/harmony.md b/docs/AppDocs/usesdk/harmony.md
index 223b7aefaeec3c8682d99955e09aa5855fa3da37..0c2e3a170309d44fc8efaee18c24253a7c089892 100644
--- a/docs/AppDocs/usesdk/harmony.md
+++ b/docs/AppDocs/usesdk/harmony.md
@@ -27,3 +27,21 @@ export default class EntryAbility extends UniEntryAbility {
   }
 }
 ```
+5.示例代码是UniApp 中用于注册支付扩展服务的核心逻辑
+
+import { registerUniProvider, uni } from '@dcloudio/uni-app-runtime'
+import { UniPaymentAlipayProviderImpl } from '@uni_modules/uni-payment-alipay'
+import { UniPaymentWxpayProviderImpl } from '@uni_modules/uni-payment-wxpay'
+
+// 初始化 Uni 扩展模块的入口函数
+export function initUniModules() {
+  initUniExtApi() // 调用扩展 API 初始化函数
+}
+
+// 初始化扩展 API（核心逻辑）
+function initUniExtApi() {
+  // 注册支付宝支付提供商：服务类型为 'payment'，标识为 'alipay'
+  registerUniProvider('payment', 'alipay', new UniPaymentAlipayProviderImpl())
+  // 注册微信支付提供商：服务类型为 'payment'，标识为 'wxpay'
+  registerUniProvider('payment', 'wxpay', new UniPaymentWxpayProviderImpl())
+}
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