Unless the order has shipped, a refund can only be requested within 48 hours of purchase and you need to send your email and order number to Z2 Comics along with your request. If you haven't received your refund, please check your bank account again first and then you need to contact your credit card company, it may take some time for your refund to be officially released.
You are able to choose to check out by Bitcoin, Visa, Mastercard, American Express, Discover, PayPal, Apple pay, Google pay, Shop Pay, Venmo, Facebook Pay, Diners Club and so on. If you paid by credit card, its systems may somehow decline your payment at checkout to prevent possible credit card fraud at Z2 Comics.