Yep had this "problem" on the App. Not really a problem just not user friendly. So the main page you see when you open the app would show payments received and pending payments. Just keep scrolling down past this until you see "recent activity". You can refund transactions(full or partial) for up to 180 days. You will see the payment received in that recent activity list, select it and the button appears to do the refund. Really hope this helps
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