I've received a suggestion from your company about integration with VISA with android applications. There are mention about ciphering with OPC. But i can't find any informaton on forums right now. Can you provide some info about that? Thank in advance.
To provide you with further assistance, can you please let me know the API that you're interested in using for your project? What is your business use case?
Please check our website for specific APIs relevant to your business case.
If you're looking for HCE payment solution, then I recommend you to use the Visa Token Service HCE SDK. One of VTS' key features, is that it supports online, in-store, and mobile in-app purchases with flexible deployment and management options. For information on VTS please visit this link - https://developer.visa.com/capabilities/vts