curl --request POST \
  --url https://api.sand.getivy.de/api/service/subaccount/create \
  --header 'Content-Type: application/json' \
  --header 'X-Ivy-Api-Key: <api-key>' \
  --data '{
  "legalName": "<string>",
  "mcc": "<string>",
  "websiteUrl": "<string>"
}'

{
  "id": "<string>",
  "legalName": "<string>",
  "status": "active",
  "mcc": "<string>",
  "ownerId": "<any>",
  "websiteUrl": "<string>",
  "createdAt": "<any>",
  "updatedAt": "<any>",
  "themeName": "default"
}