We retested your post-purchase feature following your exact instructions, but the upsell offer still didn't pop up after checkout. See this screencast on how we retested the app. Also since the app is confirmed to have a feature for post purchase, we require that you add the `write_checkout_extensions' scope.
Done
After investigation, our technical team found that the app is missing the “write_checkout_extensions_apis” permission, which cannot be requested directly for the live version. Therefore, our team has decided to remove the Post-purchase upsell feature entirely.
