curl --request PATCH \
  --url http://localhost:3000/api/v1/vault/entries/{agent}/{service} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "type": "smtp",
  "label": "<string>",
  "credentials": {}
}
'

{
  "ok": true,
  "data": {
    "agent": "<string>",
    "service": "<string>",
    "type": "<string>",
    "keys": [
      "<string>"
    ]
  }
}