A customer is trying to pay via PayPal using the ‘review and pay’ link on an emailed invoice. He clicks the link and gets ‘unexpected error’. Please help!

I'm here to lend a hand, sales91.

There are times that the default browser of your customer is filled with data and temporary files from previously visited websites. 

To fix this, kindly have your customer open the emailed invoice using an incognito window. Doing so helps isolate the issue. You can use the keyboard shortcuts below:

• Chrome: Ctrl+Shift+N
• Internet Explorer: Ctrl+Shift+P
• Firefox: Ctrl+Shift+
• Safari: Command+Shift+N

Once a private browser is open, have your customer try to pay invoice again. If it works, to ensure this doesn't happen again, it's a good idea to clear the cache of the browser you're using or trying other supported browsers. 

You can get back to me anytime you have additional questions in QuickBooks by posting your response below. I'll do whatever it takes to ensure your concerns are addressed. Have a great day.