As you have already searched for getValuesOfAutofillInputs and PaymentAutofillConfig without any results, it is possible that this issue might be related to how Facebook’s webview handles autofill features for payment information.
Try this steps:
- Replicate the issue: Try to reproduce the issue on multiple iOS devices and different versions of the Facebook and Instagram apps.
- Test in other webviews: Test your app in other webview environments on iOS, such as within the Twitter app
- Debug in the iOS Simulator: You can use the iOS Simulator, available in Xcode, to debug the issue in a simulated iOS environment
- Report the issue to Facebook
In the meantime, consider providing your users with guidance on how to open your app links outside of Facebook or Instagram webviews to avoid encountering the error.
Good luck!