Why can't I buy anything on Gumroad?

I'm curious, why am I unable to make any purchases on Gumroad? Is there a specific reason behind this? Is it a temporary issue or something that's been ongoing? I've tried multiple payment methods and they all seem to be declined. Could it be an issue with my account settings or is it something on Gumroad's side? I'd really appreciate some clarity on this matter as I've been wanting to buy some digital products from the platform for quite some time now.