After proceeding with the subscription to Sandbox, the data below will be answered.

orderID:3MA30854KN5622241
subscriptionID:I-E1DY12BAWXD1

With the above information, it is possible to suspend the subscription, but it does not appear to be refundable for the subscription.

API https://api-m.paypal.com/v1/billing/subscriptions/{id}

I checked if there was any information if I searched for subscription information inside the website apkzity, but I couldn't find a way to process a subscription refund in the response value, so I'm asking for your help.

If a refund is originally impossible, I would appreciate it if you could let me know that it is impossible. Thank you.

How to handle PayPal subscription cancellation and refund processing with API