# Shopify Plus + Scripts

{% hint style="info" %}
Shopify is deprecating Checkout Scripts! Intelligems highly recommends using functions instead.
{% endhint %}

## Add `useIgCart()`

* Use the [`useIgCart()`](/version-1.2.16/reference/hooks/cart-and-checkout-hooks.md#useigcart) hook if your site uses the Storefront **Cart** API.
* Wrap ATC calls with the `wrapCustomAttributes` function returned by `useIgCart` when you need line item properties (for example, shipping tests).

## Add Intelligems Script to `checkout.liquid`

The Intelligems script may be found under *settings* at [app.intelligems.io](https://app.intelligems.io). Copy this script tag and add it to the header of `checkout.liquid`.

## Add Intelligems Checkout Script to Script Editor

Add the following script to your Script Editor app as a line item discount.

{% code overflow="wrap" %}

```ruby
class Intelligems
  def initialize(discount_property = '_igp', allow_free = false)
    @volume_discount_property = '_igvd'
    @volume_discount_message_property = '_igvd_message'
    @depreciated_property = '_igLineItemDiscount'
    @discount_property = discount_property
    @allow_free = allow_free
  end

  def discount_product(line_item)
    ig_price = Money.new(cents: line_item.properties[@discount_property])

    discount = line_item.line_price - ig_price
    if discount > Money.zero
      discount *= line_item.quantity
      line_item.change_line_price(line_item.line_price - discount, message: 'Discount')
    end

  end

  def depreciated_discount_product(line_item)
    discount = Money.new(cents: line_item.properties[@depreciated_property])
    discount *= line_item.quantity

    if @allow_free or discount < line_item.line_price
      line_item.change_line_price(line_item.line_price - discount, message: 'Intelligems')
    end
  end

  def volume_discount(line_item)
    discount = Money.new(cents: line_item.properties[@volume_discount_property])
    discount *= line_item.quantity

    if discount < line_item.line_price
      message = line_item.properties[@volume_discount_message_property]
      line_item.change_line_price(line_item.line_price - discount, message: message)
    end
  end

  def run(cart)
    cart.line_items.each do |line_item|
      if !line_item.properties[@discount_property].nil? && !line_item.properties[@discount_property].empty?
        discount_product(line_item)
      elsif !line_item.properties[@volume_discount_property].nil? && !line_item.properties[@volume_discount_property].empty?
        volume_discount(line_item)
      elsif !line_item.properties[@depreciated_property].nil? && !line_item.properties[@depreciated_property].empty?
             depreciated_discount_product(line_item)
      end
    end
  end
end

intelligems = Intelligems.new()
intelligems.run(Input.cart)

Output.cart = Input.cart
```

{% endcode %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://headless.intelligems.io/version-1.2.16/usage/update-atc-events/shopify-plus-+-scripts.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.