Hi Domenic_Ali,
Getting an error message when trying to make a payment can be time-consuming. Don't worry, I'd be happy to help so your clients can pay you with ease.
First, I'd like to start off by doing some troubleshooting to determine if this isn't a browser related issue. Could you have your client clear cache and cookies on their browser? Doing this will help fix most issues the site may be having. Here's an article which shows you how to do that: How to clear cache and cookies. If this doesn't work, I suggest having them use a private/incognito window.
If they're still having issues, I recommend contacting our support team using this link. Otherwise, enjoy the rest of your week and feel free to reach out if you need anything.
