Hello, @tom11.

I've got some options that can help you get an online customer approval system set up for your Estimates in QBO. While the ability for a customer to approve these transactions isn't currently available, it's an often-requested feature that we hear a lot. Rest assured, I'll be sending a feature request up to our Development Team for consideration. All it takes is a voice like your own to make the changes we all want to see in QuickBooks Online.

In the meantime, I have a great news: QBO has thousands of supported third-party apps that serve a multitude of purposes, and it looks like several offer platforms for customer-approving Estimates. Just head to the QuickBooks App Center and search for a keyword like Estimates to get started.

Please know you can always reach me here should you need any help with QuickBooks, I want to ensure your success. Thanks for coming to the Community and take care.