We also have a separate forum called Intuit Developers, where you can find engineers who can help recommend third-party applications. In this website, you can connect with developers who can help with app integrations. Click this link to our website: Intuit Developers Community.
Additionally, you can manually record Etsy fees. I'm adding the steps below:
Step 1: Create the customer invoice.
Click the Plus (+) icon.
Enter the exact amount to be invoiced. (See screenshot below)
Step 2: Receive the payment.
On the invoice, click the Receive Payment button.
Select the correct invoice on the Receive Payment screen.
In the Deposit to field, choose Undeposited Funds.
Click Save and close. (See screenshot attached)
Step 3: Enter a Bank Deposit for the fee to relieve the balance from Undeposited Funds account to bank account. (See screenshot)
Click the QuickBooks Plus (+) icon.
Select Bank Deposit.
Mark the invoice payment you received previously from the Select the payments included in this deposit section.
Expand the Add funds to this deposit section to add a new line item.
In the Received From column, enter the credit card fee as a vendor.
In the Account column, add an expense account for the fee.
In the Amount field, enter a negative fee amount.
Make sure the deposit matches the net bank deposit amount.