回调返回数据如下：

<xml><ToUserName><![CDATA[wwbebe56ddead91b0a]]></ToUserName><FromUserName><![CDATA[sys]]></FromUserName><CreateTime>1608606776</CreateTime><MsgType><![CDATA[event]]></MsgType><Event><![CDATA[change_external_contact]]></Event><ChangeType><![CDATA[add_external_contact]]></ChangeType><UserID><![CDATA[LiFengXiang]]></UserID><ExternalUserID><![CDATA[wm1DICCQAALi4iOa5chlmFiNoB0CyGxg]]></ExternalUserID><State><![CDATA[18,11]]></State><WelcomeCode><![CDATA[ppSk2WNVfxeEt5tWnKIXRbFQCtMlLJUyt_xJJ1Py4Po]]></WelcomeCode></xml>

联系我配置信息如下：

{"config_id":"dc1b81ee3129872fe32276bdf88db465","type":1,"scene":2,"qr_code":"https:\/\/wework.qpic.cn\/wwpic\/453230_3AZm29KkTViqMEA_1608606673\/0","skip_verify":true,"remark":"","state":"18,11","user":["LiFengXiang"],"party":[]}}

请问能帮忙回答下是为什么吗？？？谢谢