Access product purchase information in an automation flow

First, inside a flow, you need the trigger to be "Form Submission" and the form needs to be a Purchase form.

Next, you'll want to use the Condition step.

Finally, in another tab, you'll want to open up that purchase form and find the product id's so you know exactly which one you're filtering for.

In that Purchase form, click on "Products" and then hover over the product and click on the gear icon.

Then you'll see the product id.

If you have multiple products, you'll need to check each product to find which one you're filtering for.

Once you've got the correct product id that you want to filter for, go back to the flow in the other tab, choose the product id and click save.