"Even if it ends up being something that ends the universe, it at least will have been a fun ride. So let's do it." That's what Karl Meisterheim said when Kurt pitched him on building a Shopify app. Over a year later, Promo Party Pro is live, and the journey from "this should be easy" to "why is the cart API doing that" was anything but smooth. Kurt, Paul Reda, and Karl sit down to talk through the whole thing: why free gift with purchase is Kurt's favorite promo, the edge cases that nearly broke them, the popup cooldown debate that consumed days, and what it actually takes to ship a polished app on Shopify in 2025. SPONSORS Swym - Wishlists, Back in Stock alerts, & more getswym.com/kurt Cleverific - Smart order editing for Shopify cleverific.com Zipify - Build high-converting sales funnels zipify.com/KURT LINKS Promo Party Pro: https://promoparty.app/ Crowdfunder App: https://apps.shopify.com/crowdfunder Ethercycle: https://ethercycle.com WORK WITH KURT Apply for Shopify Help ethercycle.com/apply See Our Results ethercycle.com/work Free Newsletter kurtelster.com The Unofficial Shopify Podcast is hosted by Kurt Elster and explores the stories behind successful Shopify stores. Get actionable insights, practical strategies, and proven tactics from entrepreneurs who've built thriving ecommerce businesses.