I am trying to set up a promotion for 15% off certain products. I have
applied a promotion id to a few products in this category for testing. I
put this promo id in the custom label 0 like you mentioned and now I am
trying to set up the rule that it sees this promo id from the shopify feed
and it will be applied accordingly. Do you have the options I should
choose so this will work? How would I say that this works? Would these test
products display a coupon?