One year ago, Shopify announced that they would no longer be supporting the Shopify plugin for WordPress and instead direct users toward use of the Buy Button embed code. Stepping up to fill this gap in the WP ecosystem, Andrew Robbins has been hard at work developing WP Shopify. He is offering both a free version and a premium version. WP Shopify makes use of the Shopify API, rather than simply providing iframe embeds (as the old plugin had done).
I have not personally built any integrations with Shopify, but would will happily bookmark this tool should I need a Shopify tool down the road. Depending on which version you use, you'll benefit from manual, automatic, and selective syncing of products and customers using WP custom post types, pre-built templates, and webhooks. Well done, Andrew! Thanks for putting this out there!