curl --request GET \
  --url https://api.headlesscommerce.io/v1/admin/inventory \
  --header 'Authorization: Bearer <token>'

{
  "data": [
    {
      "id": "<string>",
      "variant_id": "<string>",
      "track_inventory": true,
      "allow_backorder": true,
      "safety_stock": 123,
      "on_hand": 123,
      "reserved": 123,
      "available": 123,
      "metadata": {}
    }
  ],
  "total_count": 123,
  "has_more": true,
  "next_cursor": "<string>"
}