Printify currently has integrations with Shopify, Etsy, WooCommerce, and eBay. Additionally through various plugins on these sales channels, merchants can expand to other channels such as Facebook.
With Integrations, all order operations are automated and users only need to worry about selling and marketing their products.
However, using printify.com for manual order submission allows merchants to sell virtually anywhere as long as merchants are willing to put in more technical work.