Everything's been fine with QB for the last three years -- yesterday and today, I've had 4 clients try to pay using credit card through their invoice and receiving the message "Error - Payment wasn't successful. Try again or contact your seller." Anyone else experiencing this or have any insight?
Thanks for reaching out to us here. It's important that your customers are able to successfully pay their invoice with QuickBooks Online Payments. This has been reported by other customers as well, so you're not alone. For this reason, I encourage you to contact us outside of Community. A member of our Customer Care team can work with you in real-time and gather the necessary elements for further investigation, with our Development Team. In addition, they'll be able to set you up with an email notification when the issue has been resolved.
Schedule a Callback or start a Chat: click (?) Help in the upper right in QuickBooks Online > enter "Contact support" > hit Contact Us > provide a brief summary of your situation > hit Let's Talk > choose Get a callback or Start a Chat.