The policy: no refunds
Paid subscriptions (Pro and Max) are non-refundable. When you subscribe you’re charged for the billing period you chose (monthly or annual), and that payment isn’t returned once the period has begun — including any unused time if you cancel partway through.
The same is true of the trial fee. A trial is bought, not given: you pay a one-off fee up front, it buys those days, and it isn’t returned — whether you cancel on day one or let the trial run out.
You can cancel anytime from your account settings or the billing portal. Cancelling stops the next renewal; you keep your paid features until the end of the period you’ve already paid for, then drop back to Free. Your practice history stays put either way.