Hi, my QBO do not apply customer credit to invoice and I can't find applying credit option on account and setting? please guide me how to solve this problem

I'm glad to guide you through the steps on how to apply a credit to an invoice, cfo-tankhaa-com.

Applying a credit to an invoice is pretty easy. All you need to do is manually use the Receive payment function.

Let me show you how to accomplish this.

1. Click + New, then Receive payment.
2. From the Customer drop-down, select the customer.
3. On the Outstanding Transactions section, mark the invoice you want to apply the credit note to.
4. From the Credits section, mark the credit notes you want to apply.
5. For the open invoice in the Payment column, enter how much of the credit you want to apply.
6. Fill out the rest of the form, including the Payment date.
7. Make sure the total is correct after applying the credit note.
8. When you're done, click Save and close.

If you want QuickBooks to automatically apply the credits to future invoices, you can enable it on the settings. Here's how:

1. Click the Gear icon, then Account and settings.
2. Go to the Advanced tab, then Automation.
   
3. Turn on the Automatically apply credits.
4. Click Save, then Done.

If your customer wants a refund, you can also record that in QuickBooks. Here's a link for your guide: Record a customer refund in QuickBooks Online.

Stay in touch with me if there's anything else I can help you with apply customer credit. I'm always around here in the Community Forum to help you.