We don't presently connect to Shopify.
We believe BigCommerce is the future of eCommerce, and pair well given their focus on the B2B market; which is who we serve best.
Hopefully we're a great a reason to make the transition to BigCommerce ;-)
While there is no planned date at this point to support Shopify, it is likely we'll one day build out a connection.
We do keep a list of interested parties. Please shoot us an email w/ your interest, and we will be sure to email you any updates if/when we go into development for Shopify.