Welcome to the Community, Rene. Let me share some information about customer financing.
Customer financing is a service that allows customers to pay for products, goods, or services over an extended period of time. In QuickBooks Online, you can't initiate the service directly. However, you can use and integrate a third-party financing service provider to act as a lender at the point of sale. What you can do in QuickBooks is to receive, record, and track the payments from those third-party apps so you can manage your account.
Additionally, you can check this article for more details about manually tracking loans and repayments: Track customer loans in QuickBooks Online.
Keep us posted if you have other concerns with customer financing or any QuickBooks-related inquiries. We're here to help you out. Have a nice day ahead!