Push notifications are the most cited reason UK Shopify brands build mobile apps. They're also widely misused. This guide covers what actually works, the numbers behind it, and how to build a notification strategy that drives revenue without destroying your opt-in list. Why push notifications matter commercially You have three ways to reach a customer who bought from you before: email, SMS, and push. Email: you own the list, delivery rates have declined (average email open rates in ecommerce sit around 20-25%), and inbox competition is brutal. SMS: open rates are high (90%+ within minutes) but unit costs are real - typically 4-8p per message in the UK - and audiences have less patience for frequency. Push: free per message, no deliverability issues, open rates averaging 20-40% for well-segmented notifications. The constraint is you need your customer to have your app installed and notifications enabled.…