We do offer an integration with the Ecwid Shopping Cart system! For further details on the installation and configuration of our pre-built plugin for Ecwid, please see our website link at http://green.money/ecwid.
To note when deciding whether or not to choose Ecwid as your eCommerce platform as a Green merchant, they have different tiers of service which have varying levels of permission for adding extensions to Ecwid. As of the time of writing this, the Venture, Business, and Unlimited plans are the plans which allow our plugin to be installed.*
*Last updated 11/29/2018