Note: this will only work with Stream notifications that show products:
Webooks (with product data), Shopify, Magento, Wix and Woocommerce notifications.
In case you want to show only a specific product, or want to exclude products that contain "red" or "free" in their name, follow the steps below:
Edit your product purchase notification
Go to "Customize".
Find the "Filter Rules" section.
Select the desired action: Include or Exclude.
Type the list of expressions you want to include or exclude.
For example, let's say you have a product called "Great Course", and you want to show only the purchases of this specific product, you'll need to select the "Include" option and type Great Course.
NOTE: the filter includes or excludes products that contain the phrase.