Issue: When trying to add a Credit Card you get the error "Could not load file or assembly 'CefSharp.Core.dll' or one of its dependencies. The specified module could not be found."
Solution: You need to install Visual C++ 2013 Redistributable (both x86 and x64).
The packages need to be installed on the terminal server where the add-on/SAP Business One client is running.
Please navigate to: https://www.microsoft.com/en-us/download/details.aspx?id=40784
Wait for the download to finish and install both versions.
Restart iPayment and try again.