For some reason, my payment processor created 2 separate deposits for credit card payments for one day's activity. How can I match both deposits to the same invoice?

Thanks for sharing the details of your concern with us, @cheese

In QuickBooks Online (QBO), matching two deposits to one invoice isn't possible. A single deposit can only be linked to several transactions.

To isolate this, I recommend contacting your bank to find out why there are two deposits for one invoice payment. There, one of their live agents can investigate the situation and offer you the best solution.

In the meantime, you can delete those deposits and create a new one with the same amount as your invoice. This way, you'll be able to link the two transactions. I'll show you how.

1. Go to the Banking or Transactions menu, then select the Banking tab.
2. Click your preferred bank and go to the For review tab.
3. Select the checkbox of the transactions to exclude.
4. Click Exclude.
5. Record a deposit and link to the invoice.

Furthermore, I'd recommend working with your accountant for other ways to record this and ensure the safety of your accounts. 

When done, you can utilize this link for reference in matching your accounts flawlessly: Reconcile an account in QuickBooks Online.

I got your back whenever you need more help matching your deposits and invoices. Just add the details in your reply and I'll be here to answer them for you. Have a good one and always stay safe!