To keep your Square payment processing integration active, you must update to the new integration
Here is a video to guide you through the process
To update, start by going to Settings

Next, navigate to Payments

Click Connect with Square

Log in to your Square account and approve the account permissions
That's it! Your new Square integration will have a green note that states "Your Square account is connected and ready to receive client payments. Click the Square button to view your account"

Let us know on the chat bubble if you have any questions!
