If a pass was purchased online with Stripe, you can refund the charge via Punchpass.

You can refund the full amount OR a partial amount, however, you can only process one refund per pass.

To start a refund, go to the customer's account page.
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​To refund a pass, click on the pass to open the pass details page.
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​To refund a membership, you'll click on the membership, scroll down to the specific pass, and then arrive on the pass details page.
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In the Payments section, you'll see a button to refund the pass purchase.
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Clicking that will bring up a window that will let you enter an amount:

You can enter the specific amounts to the cent to refund, but DO NOT use $ or any special character, simply enter the number for the refund amount.

The refund request is sent to Stripe, where it normally takes 5-10 days to be returned to a customer's card.  The pass will now show that it has been refunded, and Punchpass shows you the original charge and the refunded amount:

Please be aware that the original pass is NOT deleted when you process the refund. Here's how to delete a pass.