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EventKey's subscribe event example

Y2J
Release： 2017-05-06 09:53:42
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If the user has ever made a payment in this official account, the EventKey will contain the last transaction order number when paying attention, such as 

last_trade_no_4002752001201704258347703919
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<xml>
    <ToUserName><![CDATA[gh_fcc4da210ff0]]></ToUserName> 
    <FromUserName><![CDATA[oiPuduCHIBb2aHvZoqSm1t7KbXtw]]></FromUserName> 
    <CreateTime>1493702623</CreateTime> 
    <MsgType><![CDATA[event]]></MsgType> 
    <Event><![CDATA[subscribe]]></Event> 
    <EventKey><![CDATA[last_trade_no_4002752001201704258347703919]]></EventKey> </xml>
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Related labels：
EventKey，subscribe，关注事件
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