I use unionpay transaction, not careful to cancel the deal, how a refund

[就是混混混]

I use the unionpay to steam the top-up 30 RMB, showed to be processed, cancel the deal, how money back to me, how long will it take. Or charge to the steam account.

[76561198218426745]

First, let's confirm the transaction even succeeded.
https://help.steampowered.com/#HelpWithPurchase

Does it say "Pending"?
Steam does not have the money yet, you may be able to cancel.

Does it say "Failed"?
Steam does not have the money, and so cannot refund you. Contact your payment provider to find out when the hold will be released.

If the transaction does not say pending or failed, ask for a refund as explained below:
https://support.steampowered.com/kb_article.php?ref=6695-QIKM-7966