While experimenting on invoice payment means window, I could found that once I enter the details of two or three credit cards and click "OK" button, this will be stored somewhere and when I open the payment means window next time, the details that I entered previously will be automatically displayed. It would be wonderful if anyone tell me where these in formations are being stored.
Check the RCT3 (Credit Vouchers) table in the appropriate database you are using with SBO. I found this using the debugging tool within SBO: Tools -> User Tools -> Display Debugging Information. Hover over the field in question, and look to the bottom left corner of the window. There are some tables related to RCT3 that may also help you: ORCT, and OCRP both may help depending on what exact information you are interested it. Hope this helps.