HELLO SIR/MAM, I USING QUICKBOOK, NOW I HAVE A PROBLEM, WHEN THE CUSTOMER CREDITS ARE AVAILABLE THAT TIME I CREAT THE INVOICE , THE INVOICE SHOWS THE BALANCE DUE?

Hello there, @drishtee-team.

I've got you covered in getting this balance due on an invoice concern sorted out.

We can try to check if the credit was associated with the right invoice. It's possible that the customer that you're working with has another outstanding invoice and the credit was linked to it.

To check the invoice and its payment:

1. Click on Sales at the left pane.
2. Refer to the Customers tab.
3. Look for your customer's current paid transactions to see if the payment is correct.

If you happen to see an incorrect payment, let's go ahead and turn off the Automatically apply credits option in QuickBooks Online, so your customer's credit will not be applied to the incorrect invoice. 

The Automatically apply credits feature is the reason why the invoice that you're working with is showing as overdue, since any credit on the same customer will be used to any open invoices.

To turn it off:

1. Select the Gear icon.
2. Click Account and Settings. 
3. Tap on Advanced on the left of the screen.
4. Click the Pencil icon in Automation.
5. make sure to disable the Automatically apply credits option. 
6. Click Save and select Done.

Once done, we can now delete the payment that was associated with the invoice. This way, the invoice will be marked as unpaid, and you can apply the appropriate payment.

Here's how:

1. Open your customers invoice and double click it.
2. On the Payment Status section, click the 1 payment link and tap on the Date hyperlink. 
3. Press on More.
4. Choose on Delete. 
5. Click Yes to confirm.

I'm also adding this link that you can use in managing your customer's credits in QuickBooks Online: Handle a customer credit or overpayment in QuickBooks Online.

However, if the credit was applied to the right invoice and still showing a balance due, let's go ahead and access your account on a private window. It can help us determine if the issue was caused by the corrupted data on your browser.

If the invoice is now showing as paid, you may go back to your regular browser and clear its cache. Web-based platforms like QBO collect cache files to save you time when loading repetitive data and images, but too much may lead to odd behavior like the one that you've experienced.

You can also check out this article to learn more on what are the browsers that work best in QuickBooks Online: Find out what computer and browser you need for the best QuickBooks experience.

Should you need additional assistance about this or with QuickBooks, please let me know. I'll be around for you. Take care.