Allow me to provide some information on accessing your customer's payment from Amazon, @stillwater2
Before anything, I'd like to confirm if you've integrated Amazon Sellers Central into QuickBooks Online. If so, QuickBooks will automatically track payments from your customers and map them to the correct accounts.
If this isn't the case, I recommend reaching out to Amazon so they can review the integration setup.
If you're importing transactions manually from Amazon to QuickBooks, you can access your customer's deposits through the bank page.
For your future reference, you can refer to these articles to learn how to manage your downloaded transactions: