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-service-impl/src/main/resources/mapper/PayTransactionNotifyTaskMapper.xml

@@ -0,0 +1,44 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+<mapper namespace="cn.iocoder.mall.pay.dao.PayTransactionNotifyTaskMapper">
+
+    <sql id="FIELDS">
+        id, transaction_id, transaction_extension_id, app_id, order_id,
+        status, last_Notify_time, notify_times, max_notify_times, create_time
+    </sql>
+
+    <insert id="insert" parameterType="PayTransactionNotifyTaskDO" useGeneratedKeys="true" keyColumn="id" keyProperty="id">
+        INSERT INTO transaction_notify_task (
+            transaction_id, transaction_extension_id, app_id, order_id,
+            status, last_notify_time, notify_times, max_notify_times
+        ) VALUES (
+            #{transactionId}, #{transactionExtensionId}, #{appId}, #{orderId},
+            #{status}, #{lastNotifyTime}, #{notifyTimes}, #{maxNotifyTimes}
+        )
+    </insert>
+
+    <update id="update" parameterType="PayTransactionNotifyTaskDO">
+        UPDATE transaction_notify_task
+        <set>
+            <if test="status != null">
+                , status = #{status}
+            </if>
+            <if test="lastNotifyTime != null">
+                , last_notify_time = #{lastNotifyTime}
+            </if>
+            <if test="notifyTimes != null">
+                , notify_times = #{notifyTimes}
+            </if>
+        </set>
+        WHERE id = #{id}
+    </update>
+
+    <!--<select id="selectByTransactionCode" parameterType="String" resultType="PayTransactionExtensionDO">-->
+        <!--SELECT-->
+        <!--<include refid="FIELDS"/>-->
+        <!--FROM transaction_extension-->
+        <!--WHERE transaction_code = #{transactionCode}-->
+        <!--LIMIT 1-->
+    <!--</select>-->
+
+</mapper>