Let's sort this out so you can process your payment transactions, accounting376.
Did you encounter a specific error when doing it? What page in QuickBooks Online you encountered the error? What else did you do?
Meanwhile, we can do basic troubleshooting steps as our first attempt in fixing the problem. Cache boosts browser's background processes. However, it can also cause issues when piled up. Here's how to get rid of any cache-related issues:
Log in your QBO account in a private browser. It uses but doesn't store cache.
If you can process payments successfully, we can go back to your regular browse and clear the cache.