does it cost to refund a payment on stripe code example

Example: stripe payment refund

{
  "id": "re_1I65p52eZvKYlo2CrOr8b3iF",
  "object": "refund",
  "amount": 100,
  "balance_transaction": null,
  "charge": "ch_1I65p42eZvKYlo2Ch6Z0IPRW",
  "created": 1609815783,
  "currency": "usd",
  "metadata": {},
  "payment_intent": null,
  "reason": null,
  "receipt_number": null,
  "source_transfer_reversal": null,
  "status": "succeeded",
  "transfer_reversal": null
}