recently doing a deposit-related function, providing Alipay, WeChat Pay. When users refund, how can the deposit be returned the same way? although Alipay and Wechat provide a refund interface, 
but there is a time limit, how to ensure that the deposit will be refunded in the same way for orders that exceed the time limit?
like mobike and ofo, the deposit has exceeded the time limit, and you can get a refund in the same way. how do you get it?
can only use the transfer API . There is nothing to say about the refund of other people's interfaces that have exceeded the time limit.
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