I received invoice and can't pay. I put all info but at the end it shows me error.

Thank you for posting here in the Community, @shelen.

There are some possible reasons why you encountered this kind of error. 

I recommend using a private or incognito browser. From there, we can determine if it is a browser issue or not. 

If you can process the transaction in a private/incognito browser, I advise clearing your browser’s cache to fix the issue when using QuickBooks Online. Also, this will help you to have the best and most secure experience.

To clear your browser’s cache, here’s how.

1. On your computer, open Chrome.

2. At the top right, click More.

3. Click More tools  Clear browsing data.

4. At the top, choose a time range. To delete everything, select All time.

5. Next to Cookies and other site data and Cached images and files, check the boxes.

6. Click Clear data.

If you’re using a different browser, you may refer to this article for more detailed steps and information. Clear cache and cookies to fix issues when using QuickBooks Online.

If the error persists, you may also try using other browsers.

Leave a comment below if you need further assistance, I’ll be glad to help. Have a nice day!