script_a.rb

BLOCK_ID = "640f512c6251038ecacb8fa7" # Replace with block id
DISCOUNT = 0.10  # Provides a 10% discount
DISCOUNT_MESSAGE = "Checkout offer"
HAS_NORMAL_PRODUCT = false

Input.cart.line_items.each do |line_item|  
  next unless !line_item.properties.has_key?("_checkoutblocks")  
  HAS_NORMAL_PRODUCT = true  
  break
end

Input.cart.line_items.each do |line_item|  
  next unless HAS_NORMAL_PRODUCT  
  next unless line_item.properties.has_key?("_checkoutblocks")  
  next unless line_item.properties.has_value?(BLOCK_ID)
  
  DISCOUNT_AMOUNT = line_item.line_price * DISCOUNT  
  line_item.change_line_price(line_item.line_price - DISCOUNT_AMOUNT, message: DISCOUNT_MESSAGE)
end

Output.cart = Input.cart

script_b.rb

DiscountConfig = Struct.new(:block_id, :percentage, :message) do
  def applicable?(line_item)
    line_item.properties["_checkoutblocks"] == block_id
  end

  def apply_discount(line_item)
    return unless applicable?(line_item)
    discount_amount = line_item.line_price * percentage
    new_price = line_item.line_price - discount_amount
    line_item.change_line_price(new_price, message: message)
  end
end

# Define multiple discount configurations
discount_configs = [
  DiscountConfig.new("640f512c6251038ecacb8fa7", 0.1, "Checkout offer 1"), # BLOCK_ID, discount (10%), message
  DiscountConfig.new("BLOCK_ID", 0.15, "Checkout offer 2"), # BLOCK_ID, discount (15%), message
  # Add more block discounts as needed
]

Input.cart.line_items.each do |line_item|
  discount_configs.each { |config| config.apply_discount(line_item) }
end

Output.cart = Input.cart