Currently, the "Recommendations Discount" app block does not support checking which collections products are in. This is due to limitations in Shopify itself. The Product Recommendations API , which this app block is based on, does not provide any information about which collections the products it recommends are in. In addition, the Shopify AJAX API has no way to retrieve this information, either. If you'd like to receive updates on this feature request in your inbox, please upvote and comment on this thread.