Hmm, looks dodgy to me. Their social media posting stopped abruptly in August last year (both Facebook and Twitter) and their Facebook page doesn't seem to have any visitor post section. When I Google them, I don't see any reviews or comments on the usual tech and entertainment sites, just a handful of "is this a scam" pages. Something feels off to me. If you're going to give them a credit card, use a preloaded Visa debit with hardly any money in it that is not linked to your bank accounts. That way if they're a scam you're limiting your risk.