curl --request GET \
  --url https://api.sandbox.monite.com/v1/document_templates/{document_template_id}/preview \
  --header 'Authorization: Bearer <token>' \
  --header 'x-monite-entity-id: <x-monite-entity-id>' \
  --header 'x-monite-version: <x-monite-version>'

{
  "detail": [
    {
      "loc": [
        "<string>"
      ],
      "msg": "<string>",
      "type": "<string>"
    }
  ]
}