Since we cannot determine how much the customer has every spent, we are able to determine the total number of orders they have placed

Shopify Script - X% off if customer placed more than Y orders

customer = Input.cart.customer
discount = 0
message = ""
if customer
  if customer.orders_count > 2 #number of orders needed to get discount
    discount = 0.2 #percent discount in decimal form
    message = "VIP Customer"
  end
end
puts discount
Input.cart.line_items.each do |line_item|
  product = line_item.variant.product
  next if product.gift_card?
  line_item.change_line_price(line_item.line_price * (1-discount), message: message) unless discount == 0
end

Output.cart = Input.cart