Shopify Cart Abandonment Is Not a Separate Audience Segment
Shopify's pixel and Meta's Conversions API both support the ability to create audiences specifically from users who initiated checkout and did not complete a purchase. This is the highest-intent segment in any e-commerce retargeting architecture, and it should receive the most direct creative, the highest bid, and the tightest recency window. Most accounts do not have this segment built. Cart abandoners sit inside a general "website visitors" audience receiving the same creative as someone who bounced from a blog post.