SKPayment.applicationUsername is null

In iOS14 test payment, SKPayment applicationUsername can't get the data? the bug of apple????
Well, I found an explanation
https://developer.apple.com/documentation/storekit/skmutablepayment/1506088-applicationusername?language=objc

This change has a big impact on payments if you rely on ApplicationUsername,
SKPayment.applicationUsername is null
 
 
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