curl --request POST \
  --url https://sbx.api.easybilling.cloud/payment-hub/api/refund \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "transactionId": "Order-123",
  "requestId": "Order-123-R",
  "amount": "123"
}
'

{
  "transactionId": "<string>",
  "status": "<string>"
}