is there a way to make credit card information NOT VISIBLE when client receives their receipt and email confirmation?
Sorry it is not possible to have some field value visible and some not.
I would suggest one of the following
- don't request CC information with FormsCentral instead use the PayPal integration to collect payments (http://forums.adobe.com/docs/DOC-1632)
- don't "include submitted data" in the email receipt (see Options Tab > Email Receipts there is a check box for "include submitted data")