While we do not natively monitor Footsites, you can set up a Checkout Feed smart action and monitor via task input. Remember to use the Footsite SKU ("D9765600") instead of the sneaker SKU ("DH9765-600"). You can find these SKU's in the Product URL of any product on Footlocker, Champs, or Kids Footlocker. Your cookgroup likely provides a list of these.
Whenever there is a checkout that occurs with the task input that you have defined in your filters and if the store is Footlocker (or whatever Footsite you desire), it will trigger, and carry out the actions that you have in "3. Actions". You can tweak the actions to your liking.