Printout Designer requires WooCommerce 3.0.x or later and WordPress 4.4 or later, and you must enable the REST API within your WooCommerce account. To enable REST API, navigate to WooCommerce > Settings > Advanced > REST API and click the Add key. The added key must have Read/Write permissions so Printout Designer can fetch your orders and products and create webhooks for Automation Rules. You can find the full step-by-step tutorial here.