David here, from the Zapier Platform team. That's definitely something you can do, though it'll take some programming work on your part.
You'll need a Stripe API key (which can be found in your dashboard). You'll want to use a Code by Zapier step in your preferred language and make the request described here: https://stripe.com/docs/api/curl#create_refund. You'll need to get access to a charge id, which could be pulled from a New Charge trigger or Find Charge action.
Hopefully that points you in the right direction!
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