curl --request GET \
  --url https://production.api.onvy.health/users/{user_id}/custom_records/{record_id} \
  --header 'X-API-Key: <api-key>'

{
  "custom_records_type_id": "<string>",
  "data": {},
  "id": "<string>",
  "project_id": "<string>",
  "user_id": "<string>",
  "description": "<string>",
  "attachments": [
    {
      "mime_type": "<string>",
      "description": "<string>",
      "data_base64": "<string>",
      "data_url": "<string>"
    }
  ],
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z"
}