Whilst we support PayPal as the main payment option on SellMyRetro.com, we do sometimes get asked about paying for items via debit or credit card without needing a PayPal account.
There is a way around this. If you have a business account on PayPal, there is a setting in your profile preferences to allow "guest checkout". With that selected, customers can enter their debit or credit card details directly into PayPal without needing an actual PayPal account
Unfortunately, those sellers who only have a personal PayPal account do not have this option.