I'll help you view your invoices, @Susansylke.

You'll want to toggle the date of your customer transaction list and ensure it's set to view the recent invoices.

Here's how:
 

1. Go to the Sales menu in your QuickBooks Online (QBO) account.
2. Select the Customers tab.
3. Double-click on your preferred customer.
4. Select the Transaction List column.
5. Click the DATE column and make sure the arrow is facing down to show your recent invoices. 
6. You can also click the Filter drop-down menu to narrow down your search.

Once you're all set, I got you this article that can guide you on how to seamlessly account for your customers payments: Record invoice payments in QuickBooks Online.

I'm just a post away if you need more help managing your invoices and customers in QBO. Have a great weekend and keep safe!

QuickBooks Payments: Send email invoices with a Pay Now Button, and make it easy for your customers to pay directly within the invoice. Same rates for all major credit cards (2.9% + $. 25 for an invoice paid online).   My Fortiva Account