This payment extension is an updated version of the bult-in Square Payment extension. The built-in version has become obsolete because it uses an old and now discontinued API.

This new replacement version uses the latest Squareup API and OAuth2.

It supports Quick Pay where the user is redirected to the Square payment gateway for the checkout payment.
It also supports am iframe-based checkout for the payment where the user stays on Opencart-based checkout page.

Recurring payments are supported, too.

Note: This extension still is a beta-release, more testing needs to be done!