You can do a refund by going to www.wepay.com/home, then clicking on the donation you would want to refund under Transactions. On the checkout page, click the transaction you'd like to refund. There, you'll see a pop up to click on that says "issue refund."
Go to https://dashboard.stripe.com/login and log into your Stripe account.
From the Stripe dashboard, click on Payments.
Click on the payment that you want to refund.
When you've confirmed that the payment you have chosen is the one you want refunded, click Refund Payment.
On the Refund Payment window, you can choose whether to process a full or partial refund. Click Refund to complete the refund.