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

{
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "document_type": "receivable",
  "is_default": true,
  "language": "<string>",
  "name": "<string>",
  "template": "<string>",
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z",
  "blocks": [
    "<string>"
  ],
  "preview": {
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "created_at": "2023-11-07T05:31:56Z",
    "updated_at": "2023-11-07T05:31:56Z",
    "file_type": "<string>",
    "md5": "<string>",
    "mimetype": "<string>",
    "name": "<string>",
    "region": "<string>",
    "s3_bucket": "<string>",
    "s3_file_path": "<string>",
    "size": 123,
    "url": "<string>"
  },
  "template_type": "source_object"
}