I've integrated six gateways into Flutter apps for clients over the last few years. Here is the honest scorecard — fees, UPI support, mandates, settlement, and the gotchas the marketing pages skip.
Choosing a payment gateway for a Flutter app in India is not a coding problem. The Flutter side is nearly identical across gateways — a SDK call, a result callback, a webhook your server verifies. The real decision is business: settlement cycles, UPI AutoPay support, international card coverage, fee structures, and how painful the onboarding KYC is. Pick wrong and you find out three months in, when a payment fails, a settlement is delayed, or your international customers cannot pay at all.
I have built checkout flows with most of the serious Indian gateways for clients — a subscription fintech, an e-commerce shop, a SaaS billing app — and this is the comparison I wish I had before the first integration. I scored each gateway on the things that actually decide whether your Flutter app collects money reliably in 2026.
The Criteria
Each gateway scored out of 10 on five axes, weighted toward what production apps actually need:
