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

It shows me this error message: You can try again, or come back later and try connecting then

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!

I have the exact same issue. I tried incognito mode before I came here and am receiving the exact same error. As I am a web dev myself and am used to troubleshooting issues I would say that the error is occuring on the client, likely due to some validation that is not being met since it occurs immediately after hitting the submit button. You can tell it hadn't made it to the server yet.

Hi there, @sixHat.

Thanks for trying the incognito mode to address the issue. Let me share additional steps to fix the error and pay your client. 

Have you already tried clearing the cache in your regular browser? If not, I'd recommend checking out this article to perform this action: How to delete browser cache and Intuit-specific cookies to quickly fix issues when using QuickBooks ....

If the issue persists, use another supported browser. The error might steam from the browser itself. 

If you're still getting the same result, contact our QBO Support Team. That way, they can perform an investigation and help you address the error. Here's how to connect with them:

1. Click the Help menu in the upper-right hand corner and click Talk to a human.
2. Type in "Talk to a human", then press Enter.
3. Look for I still need a human and click on it.
4. Select Get help from a human.
5. Choose between Chat with us, Schedule an appointment, or Have us call you.

Please check out our support hours to ensure that we address your concerns on time.

Also, our Help articles might have something that can help you with your QuickBooks concerns, too. Just make sure that the topic is set as "QuickBooks Online" to browse for related post.

The Community always has your back, so please let me know if you have any other questions. I'll be more than happy to help. Keep safe.