Each recurring transaction that is set up, automatically sends an invoice to all email addresses set up for the account. On top of that, Quickbooks sends out a payment link.

To find that link, go to Quickbooks > Sales > All Sales and search for the right customer. Once located, check for the invoice that you would like to pull the payment link for. Click on 🔽 and Share invoice link. A window pops up which shows the invoice link and the option to copy it.