script.liquid

{% if event.preview %}
  {
    "action": {
      "type": "shopify",
      "options": [
        "post",
        "/admin/inventory_levels/connect.json",
        {
          "inventory_item_id": 1234567890,
          "location_id": 1234567890,
          "relocate_if_necessary": false
        }
      ]
    }
  }
{% else %}
  {% for variant in product.variants %}
    {% for location in shop.locations %}
      {
        "action": {
          "type": "shopify",
          "options": [
            "post",
            "/admin/inventory_levels/connect.json",
            {
              "inventory_item_id": {{ variant.inventory_item_id | json }},
              "location_id": {{ location.id | json }},
              "relocate_if_necessary": false
            }
          ]
        }
      }
    {% endfor %}
  {% endfor %}
{% endif %}

{% if event.preview or options.track_inventory_using_shopify__boolean or options.allow_orders_for_out_of_stock_products__boolean %}
  {
    "action": {
      "type": "shopify",
      "options": [
        "update",
        [
          "product",
          {{ product.id | json }}
        ],
        {
          "variants": [
            {% for variant in product.variants %}
              {
                "id": {{ variant.id | json }},
                "inventory_management": {% if options.track_inventory_using_shopify__boolean %}"shopify"{% else %}null{% endif %},
                "inventory_policy": {% if options.allow_orders_for_out_of_stock_products__boolean %}"continue"{% else %}"deny"{% endif %}
              }{% unless forloop.last %},{% endunless %}
            {% endfor %}
          ]
        }
      ]
    }
  }
{% endif %}