if DHL Portugal provides a no cost application with carrier-calculated rates at checkout, your only cost will be the $twenty per 30 days charged by Shopify to enable CCS.
Shopify does provide live shipping rates, but https://poppiejzys808727.signalwiki.com/934345/how_much_you_need_to_expect_you_ll_pay_for_a_good_estimate_shipping_costs_for_ecommerce_store