We're unable to retrieve a Vendor Credit Application Form, however, we can search one online and use it as an attachment when sending vendor transactions. Once the application is approved, we can record a vendor credit within QuickBooks.
Let me show you how:
Go to the + New button from the left menu.
Select Vendor credit.
From there, we can enter the credit information.
Hit Save and send or Save and close.
To attach a document, just scroll down to the transaction page let's say a Bill, and click the paper clip icon beside Attachments.
I have a few article here on how we can record vendor credit and in applying them: