A little more information might be needed such as which device you are using. Perhaps submit a formal bug report so that the developers have a little more information to work with.
It is working fine here on both an iPhone SE and 6S Plus which both updated to iOS 11 without any noticeable problems.
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Can you please let me know if the issue is resolved or if you are still experiencing an issue? Also, please let me know the API that you are using.
Can you please let me know the API that you are using for your project? For a list of APIs, please navigate to this link - https://developer.visa.com/apibrowser