curl --request POST \
  --url https://access.utgl.io/v1/xmetadata/set \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "target": {
    "type": "cardaccount",
    "id": "xxx"
  },
  "xid": "<string>",
  "xmetadata": "<unknown>"
}
'

{
  "target": {
    "type": "cardaccount",
    "id": "xxx"
  },
  "xid": "<string>",
  "xmetadata": "<unknown>"
}