Hi there, arunsivasamy-hot.
I'll provide steps on how you can integrate your E-Commerce to QuickBooks Online for invoicing and Customer updates.
I suggest going to the Apps menu. From there, you'll have the option to search for Woo Commerce and choose E-Commerce from the list.
Please refer to the articles below on how to create and send an invoice using QuickBooks. Then, how the system can show you how many customers you have in your company file.
I'll be more than happy to help if you have any other questions. I hope my reply finds you with a smile. Have a fantastic day.