This app imports your sales, bank transfers and expenses. When a sale is recorded in PayPal, it is synced over to QuickBooks Online as a sales receipt. It includes information like which item is sold and the quantity, discount, shipping, and tax.
Transaction fees charged by PayPal are also brought over as an expense, so it is properly recognized and reflected in your accounts. Additionally, your bank transfers (from/to PayPal) and PayPal expenses are also appropriately handled.