Ask why they bought, not if they're happy

Most post-purchase surveys ask "How satisfied are you?" or "How likely are you to recommend us?" These tell you about the product experience. They tell you nothing about conversion.

The question that actually improves your conversion rate: "What almost stopped you from buying today?"

The answers are conversion gold. "I wasn't sure about the return policy." "I couldn't find whether it works with my existing tools." "The pricing was confusing." "I almost left because I couldn't find a phone number." Every answer is an objection that your page didn't address.

Ask it immediately after purchase, on the confirmation page or in the first email. Not a week later. Not in a long survey. One question. Open text. The recency makes the answers specific and actionable instead of vague and polite.