Has a real person at TFCC actually told you you need to do this, or is this just because the automated email from brianatmastercollectordotcom told you to do it? Because the whole faxing of credit cards thing dates back to 2005 when the club was even more xenophobic and clueless. Unless a real person specifically asks you do do it, I wouldn't worry about it - I suspect you're overthinking this.