I’m building a SaaS product with monthly subscriptions. What’s a reliable payment gateway, and are there any tricky parts during integration?

For SaaS, pick a payment system that supports recurring billing and proration features. Many services offer prebuilt tools to manage subscriptions easily. Still, it helps to know what is payment processing, especially when dealing with automatic renewals and failed payments. Understanding this lets you better manage retries, fraud checks, and customer communication. Integration can be straightforward with the right APIs, but test thoroughly before going live.