Hi, @LilyOuyang .
Thank you for reaching out and bringing this to our attention.
If an order was marked as high risk, then we’d recommend viewing the fraud analysis indicators to determine whether or not you should refund or fulfill the order. Since most financial institutions recommend buyers to wait 30 days before initiating a chargeback, then it’s possible that this order was placed using a stolen credit card and the cardholder was able to catch the transaction in order to initiate a chargeback within a few days. As the chargeback has already been initiated by the cardholder and the funds have been withdrawn by the bank, then we wouldn’t recommend issuing another refund. Instead, you’ll want to follow our guide on 'Managing chargebacks and inquiries’ so that you can add evidence and submit the chargeback or accept the chargeback.
That being said, if your store begins to experience more high-risk orders or chargebacks, then we’d recommend taking a look at something like Signifyd-Chargeback Protection as these services can help you make real-time decisions on your orders and provide 100% financial guarantee on approved orders. If you need to get help with a third-party app, then the app developer is always available to assist you. Simply get in touch with them using the contact information found at the bottom of their app’s page.
I noticed that you’re a new member of our Shopify Community! Once you’ve resolved the chargeback, I’d love to hear more about your business and share some resources to help you get started.