支付模块，调通对 ping++ 的调用，以实现模拟支付。

当然，整体代码还是有点乱，后面花点时间重构下~

现在，缺一个异步 MQ 通知业务方订单支付成功

pay/pay-application/src/test/java/DubboGenericInvokerTest.java

@@ -0,0 +1,32 @@
+import com.alibaba.dubbo.config.ApplicationConfig;
+import com.alibaba.dubbo.config.ReferenceConfig;
+import com.alibaba.dubbo.config.RegistryConfig;
+import com.alibaba.dubbo.rpc.service.GenericService;
+
+public class DubboGenericInvokerTest {
+
+    public static void main(String[] args) {
+        ApplicationConfig application = new ApplicationConfig();
+        application.setName("api-generic-consumer");
+
+        RegistryConfig registry = new RegistryConfig();
+        registry.setAddress("zookeeper://127.0.0.1:2181");
+
+        application.setRegistry(registry);
+
+        ReferenceConfig<GenericService> reference = new ReferenceConfig<>();
+        // 弱类型接口名
+        reference.setInterface("cn.iocoder.mall.pay.api.PayDemoService");
+        // 声明为泛化接口
+        reference.setGeneric(true);
+
+        reference.setApplication(application);
+
+        // 用com.alibaba.dubbo.rpc.service.GenericService可以替代所有接口引用
+        GenericService genericService = reference.get();
+
+        String name = (String) genericService.$invoke("updatePaySuccess", new String[]{String.class.getName()}, new Object[]{"1"});
+        System.out.println(name);
+    }
+
+}