If you use physical sales points by passing the online store you will not be able to live without the plugin WooCommerce Point of Sale. This plugin allows you to configure sales in your salon or store using Wordpress running online store based on WooCommerce.
In your Internet store, you can obtain addresses of the points of sale. And when the customer will make a purchase offline, come your shop, you will be able to issue orders via the online store, thereby maintain one account in multiple sites sales and control inventory.
In your store, you will be able to register clients, offering them the next time you use the online version of your store. The plugin supports printing, receipts and receipts. You can also receive payments by e-card, using any device, including touch.
Also, you will be able to place orders on your online store and ask the user to pick up the goods directly to your salon. The plugin supports the creation of unique identifiers of the order, with the seals, that the user could not re-contact the salon for goods.
The plugin works in the same database as you a physical store, thus you can synchronize all the data. Also the plugin does not involve any costs in the form of monthly fees or other nasty surprises. Take it and use it!