Resolve Flutter iOS Razorpay Crash

My Flutter app runs flawlessly on Android, including Razorpay payments, but the iOS build crashes as soon as a user initiates payment. Xcode does capture a crash log, yet I’m not fully certain whether the Razorpay SDK was integrated exactly as the iOS documentation prescribes.

Here’s what I need from you: ensure the Razorpay SDK is wired up the Apple-approved way, pinpoint and eliminate the crash that currently appears during payment processing, and guide me through producing a clean, crash-free release build for the App Store.

xcode error log crash report from xcode Exception NSException * "-[razorpay_flutter.RazorpayDelegate onPaymentError:description:andData:]: unrecognized selector sent to instance 0x600000297b80" 0x0000600000d3e0d0

Deliverables
• Corrected Razorpay iOS integration in the Flutter project
• Crash root-cause analysis with the relevant Xcode log snippet explained in plain English
• A final, fully tested iOS build (IPA) demonstrating successful payment flow without any instability

You should be comfortable with Flutter, CocoaPods, Xcode, and Razorpay’s native iOS SDK nuances, and be ready to screen-share or document each step so I can reproduce the release process next time.