Apply discount to all except those that have a certain tag

# This script will apply a 100% discount to all shipping methods if the customers who have a tag in the VIP_CUSTOMER_TAG array

# Define the tag that identifies VIP customers.
VIP_CUSTOMER_TAG = ['trade', 'wholesale']

if !Input.cart.customer.nil?  # Check there is actually a customer
  VIP_CUSTOMER_TAG.each do |tag|  # Loop over their tags
      if Input.cart.customer.tags.include?(tag.downcase)  # Check for upper or lower case
        Input.shipping_rates.each do |shipping_rate|  # Loop over shipping rates
          shipping_rate.apply_discount(shipping_rate.price, message: "Free shipping for Trade and Wholesale Customers!")  # Apply discount
        end
        break
      end
  end
end

# Export the rates.
Output.shipping_rates = Input.shipping_rates