Etsy stock and orders for Shopify

Shopify stays in charge of stock, Etsy follows it, and paid Etsy orders arrive in Shopify ready to pack.

• Stock follows Shopify. Etsy sizes linked by SKU update within about a minute.
• Etsy orders in Shopify. Paid orders arrive tagged, with the shipping address, ready to pack.
• Tracking goes back. Mark it shipped in Shopify and Etsy tells the buyer.