IAP not success with delayed test cards

Development Programming & Scripting Blueprint
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1

Hello,
I have a problem. IAP works fine, but when I try with slow cards, I need to recheck whether the transaction is approved or not. How can I do this? (It is approved after 2 minutes on average, but I have to question whether the transaction is approved or rejected)
Thank you

IAPSuccess
IAPSuccess840×490 89.2 KB

2

I created a restore button. If billing has been successed this metod set to restored.
This fixed my problem.

restorebutton
restorebutton1099×298 41.4 KB

Thank you.