Shopify Script #1 - Spend $A, get B% off, spend $C get D% off, spend $E get F% off

script.rb

# Spend $A, get B% off, spend $C get D% off, spend $E get F% off

# Custom Message
CHECKOUT_MESSAGE = "Special discount"

# Discount rules
# ORDER MINIMUM IN DOLLARS => DISCOUNT VALUE (%)
DISCOUNT_RULES = {
  50    => 5,
  100   => 10,
  150   => 30
}


# === Do not change anything below ===

cart = Input.cart
subtotal = cart.subtotal_price_was

# Sort discount rules by descending order
DISCOUNT_RULES = DISCOUNT_RULES.sort_by {|k,v| v}.reverse.to_h

# each if fits => apply discount & exit
DISCOUNT_RULES.each do |min_amount, discount_value|
  min_amount_value = Money.new(cents: 100) * min_amount
  percent_discount = Decimal.new(discount_value) / 100.0
  
  if subtotal >= min_amount_value
    cart.line_items.each do |line_item|
      product = line_item.variant.product
      next if product.gift_card?
      line_discount = line_item.line_price * percent_discount
      line_item.change_line_price(line_item.line_price - line_discount, message: CHECKOUT_MESSAGE) unless discount_value == 0
    end
    break
  end
end

Output.cart = Input.cart