How do I add a button for customers to click to accept estimates?

Hello drew.kelstone@gm, 

Thanks for contacting us here. QuickBooks enables you to get your work done faster using the powerful features offered in the program. I'll be happy to provide the info you need so you're on the right track. 

The program allows you to send estimates that your customers receive via email to open. Here's a helpful article that shows you how to: Create and send estimates in QuickBooks Online. In case you're looking to accepts payments online, here's a helpful article that shows you how to:  Take and process Online Payments in QuickBooks Online. 

Let me know if this info helps. I'll be a message away in case you have other questions.