Your payment tests passed in staging. Then PhonePe pushed an SDK update on Tuesday, the UPI intent deep link stopped launching on Samsung devices, and 12% of Wednesday's checkout attempts failed silently. The payment was never charged. The order was never placed. The user saw a frozen screen and uninstalled.
Payment testing is the highest-stakes, highest-maintenance area of mobile QA. It's also the area where most teams have the least automation coverage because payment flows depend on third-party SDKs, external app launches, OS-level intents, and provider-specific UI that changes without warning and without your involvement.
This guide covers how to build payment testing that actually survives sprint-to-sprint: what specifically breaks, why traditional automation struggles with payment flows, what to test at each layer, and how Vision AI validates the payment experience users actually see.
For the complete checkout testing deep dive, see Why Checkout Flows Break More Than Anything Else. For the full delivery app checklist, see 30 Test Cases from Order to Doorstep.
Key Takeaways
