curl --request GET \
  --url https://api.example.com/api/storefront/collections \
  --header 'X-Site-ID: <x-site-id>'

{
  "collections": [
    {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "title": "<string>",
      "description": "<string>",
      "handle": "<string>",
      "image_url": "<string>",
      "products_count": 123
    }
  ],
  "total": 123,
  "page": 123,
  "limit": 123,
  "pages": 123
}