curl --request POST \
  --url https://api.example.com/iser/decentralized-account/mark-default \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "accountCode": "FE7F4ED8-511D-4557-A067-5414BF604F31",
  "cryptoCode": "<string>"
}
'

{
  "success": true,
  "data": "<unknown>"
}