You have to use segment in trigger instead of Matric. Also Check Klaviyo integrations and APIs. 

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How do I do that? I used the prebuilt flow for shopify, when I clone I only get these options, when I have created a list for ‘viewed product’

• Set Flow Conditions:

  • You can refine who gets the emails. For example, if you want to target only users who haven’t purchased the product they viewed, add a condition for people who haven’t placed an order after the view.
  • Click on the "Flow Filters" section to set any specific conditions.

• Add an Email:

  • After the trigger, click the "+" to add an action and select "Send Email".
  • You can use a pre-built email template or design a custom one to remind users of the product they viewed. A good idea is to include dynamic product blocks, such as the Product Block in the email template, to show the exact product they viewed.