I run a digital agency that builds and maintains e-commerce sites for about 12 clients. Most are on shopify or bigcommerce, doing anywhere from $5M to $50M annually. Our biggest pain point is QA. We launch a site, everything works great. Three months later the client adds a new payment method or updates their shipping logic and something breaks. We don't find out until a customer complains. We can't afford to manually test every client site after every change. That would require a massive QA team. But we also can't let bugs slip through because it hurts our reputation and costs clients money. I've been looking at automation solutions but most seem designed for companies with dedicated QA teams. We need something that can monitor multiple client sites and alert us when critical flows break. Someone mentioned spur but I haven't tested it across multiple domains yet. For other agencies managing multiple e-commerce clients, how do you handle ongoing QA? Do you charge clients separately for testing? Do you automate it? What actually scales?