We are switching to Magento 2.3 and cannot seem to find a way to set up a promotion we run often - "$1 Shipping for orders over $X." Previously, we would set this code up as a Shopping Cart Price Rule and link it to the applicable shipping method via Shipping Price Rules. M2 does not seem to have a Shipping Price Rules page and there is not a field to set a flat rate shipping price in the Cart Price Rules. Could anyone provide a solution for this situation? Does this require purchase of an extension?