I didn't have to do that. I wouldn't do that! I used Paypal and it went very smoothly.
I should have used PayPal! I did use Amex, but they emailed asking for license/proof of address/utility bill. I sent them only a portion of the utility bill, which I happened to have on me. But anyway, I'm nervous! Hope everything goes smoothly. I ordered an Anya Hindmarch jacket from them that is sold out everywhere else in my size.