Discounted Shipping if cart over X

min_discount_order_amount = Money.new(cents:100) * 50
total = Input.cart.subtotal_price_was
discount = if total > min_discount_order_amount
              0.1
            else
              0
            end
message = "10% off shipping if order is over $50"

Input.shipping_rates.each do |shipping_rate|
  next unless shipping_rate.source == "shopify"
  shipping_rate.apply_discount(shipping_rate.price * discount, message: message)
end

Output.shipping_rates = Input.shipping_rates