Credit Card Payment Issues on Safari

Both the browsers I run (Safari and Chrome) have stopped processing credit card payments on a variety of different websites. This includes sites where the card is actually saved on the website and all I have to enter is the code. The payment will actually go through the credit card company verification but then I get a "your payment cannot be processed" error. My cards are completely fine. If I switch over to my iPhone's browser, everything works normally with no issues. I did update to the new Sonoma a few weeks ago but other than that, have made no changes. Never had anything happen like this before.

I have tried clearing my cookies, restarting, removing extensions. Both browsers and MacBook are updated to latest versions.

Thank you for any suggestions.