curl --request GET \
  --url https://api.heymilo.ai/api/v2/design-template-groups/{group_id} \
  --header 'X-API-KEY: <api-key>'

{
  "data": {
    "id": "<string>",
    "name": "<string>",
    "template_mappings": {},
    "created_at": 123,
    "updated_at": 123,
    "object": "design_template_group",
    "is_default": false
  },
  "meta": {}
}