Integrating a payment gateway into your app isn’t just a technical milestone—it’s a business-critical decision that affects user trust, cash flow, and long-term growth. In the era of digital-first experiences, seamless payments aren’t a luxury; they’re an expectation. And as Paul Boag puts it, "A good digital experience isn't about building a feature-rich product; it's about solving a real problem with clarity and ease." Whether you're building a mobile app for retail, booking, digital events, or subscription services, this guide will walk you through the real-world essentials of how to integrate a payment gateway—including best practices, Flutter-specific guidance, and strategic...
