Lol it IS awful. It does not accept any of my credit cards and claims its a problem with my bank when my bank said it has no issues with the authentication/payment. Everytime I try to pay an amount is deducted ~around 1 Pound but then I'm told the payment isn't going through.
I just use time cards now, and I can't buy retainers or do server transfers ever. Its really laughable and frustrating when I can use my cards for every business out there which accepts international credit cards except SE.