Your Square account can be used for Ovatu online payment and card capture functionality, as well as for in-store payments via the Square card reader. This article explains how to use Square online.
To connect your Square account for use with online payments and card capture, choose Integration > Apps
Locate the Square tile
Enter your Square account details, then click Sign In
Your Square account is now connected, and will appear as connected on the Square tile
To change your currency settings, click Options
Don't forget to also enable and customise your online payment settings :)