How to implement a 20% discount code with a $100 maximum?

Technical Q&A

Topic summary

The original poster needs to create a discount code (INFLUENCER20) that applies 20% off orders, but caps the maximum discount at $100 (meaning orders over $500 receive only $100 off instead of the full 20%).

Proposed Solutions:

• Shopify Script approach: Create a 0% discount code in Shopify, then use the Script Editor app with custom Ruby code that:

  • Checks if the cart has the specific discount code
  • Applies $100 flat discount when cart subtotal ≥ $500
  • Applies 20% discount when cart subtotal < $500
  • Distributes the discount proportionally across line items

• Alternative recommendation: Use Shopify Functions instead of Scripts (which are being deprecated). The Nex Discounts app was suggested as a no-code solution that supports capped percentage discounts.

A complete code example was provided for the Script Editor approach, including logic for calculating proportional discounts across cart items.

Summarized with AI on October 27. AI used: claude-sonnet-4-5-20250929.
1

Hi guys!

I’m having a hard time using the script editor to figure out how I can implement this:

I’ll give an influencer a promo code, say, INFLUENCER20, where it’ll give all who use it 20% discount on their total order—but only up to $100. If their carts, therefore, exceed $500, instead of getting 20% they max out their discounts to just $100.

Thanks for any insight!

1 Like
2

Hi Kevinrein,

Here’s an example script/apprach you can explore: Shopify Script - Max discount based on cart value

Steps:

  1. Create a Discount code “INFLUENCER20” with 0% discount
  2. Insert line item script in the Script editor app

example script:

|

# Check the cart has a discount code and if so it equals the campaign
if Input.cart.discount_code and Input.cart.discount_code.code == ‘INFLUENCER20’

# Conditions for when the maximum discount value applies, in this case 500 or more
if Input.cart.subtotal_price >= Money.new(cents:50000)
# Value of the maximum discount that the cart will have
max_discount = 100

# Get Float value of the cart’s cents variable in dollars
cart_subtotal_float = Float((Input.cart.subtotal_price.cents / 100).to_s)

# For each line item
Input.cart.line_items.each do |line_item|
# Get Float value of line item’s cents variable in dollars
line_price_float = Float((line_item.line_price.cents / 100).to_s)

# Calculate percentage the line items price should be reduce to
percentage = 1 - (((line_price_float / cart_subtotal_float) * max_discount) / line_price_float)
# Multiple the line item by the percentage value it needs to be
line_item.change_line_price(line_item.line_price * percentage, message: “$100 off”)
end

# If they are under the threshold reduce every line item by 0.2 (20% off)
elsif Input.cart.subtotal_price < Money.new(cents:50000)
Input.cart.line_items.each do |line_item|
line_item.change_line_price(line_item.line_price * 0.8, message: “20% off”)
end
end

end

Output.cart = Input.cart

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  1. Test, Save and Publish
1 Like
3

Hi,

Since Shopify Scripts are being deprecated soon, it’s a good idea to move to Shopify Functions for more future-proof discount logic.

I came across an app called Nex Discounts that lets you set exactly the kind of capped percentage discount you’re talking about — for example, 20% off up to $100 max. It’s easy to set up and works great for influencer codes like the one you mentioned.

Worth checking out!

1 Like