curl --request POST \
  --url https://api.sand.getivy.de/api/service/merchant/payment/refund \
  --header 'Content-Type: application/json' \
  --header 'X-Ivy-Api-Key: <api-key>' \
  --data '{
  "orderId": "<any>",
  "referenceId": "<string>",
  "amount": 123,
  "description": "<string>",
  "email": "jsmith@example.com",
  "displayedPaymentReference": "<string>"
}'

{
  "orderStatus": "failed",
  "refundStatus": "pending",
  "referenceId": "<string>",
  "orderId": "<string>"
}