docs: added sales channel conceptual guide (#2342)

* docs: added sales channel conceptual guide

* fixed file path

* added dividers

docs/content/advanced/backend/sales-channels/index.md

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+# Sales Channels
+
+In this document, you’ll learn about Sales Channels and how they can be used in Medusa.
+
+:::note
+
+The Sales Channels feature is currently in beta mode and guarded by a feature flag. To use Sales Channels either:
+
+1. Enable the `MEDUSA_FF_SALES_CHANNELS` environment variable;
+2. Or enable the `sales_channels` key in the Medusa server's settings.
+
+You can learn more about enabling it in the [feature flags](../feature-flags/toggle.md) documentation.
+
+:::
+
+## Introduction
+
+Sales Channels allow you to separate between the different channels you sell products in. For example, you can have a sales channel for your website and another for your mobile apps.
+
+Sales Channels are associated with stores, products, carts, and orders: A store has a default sales channel; you can define which products are available in a sales channel; you can specify the sales channel of a cart; you can filter orders by sales channel.
+
+### Example Use Cases
+
+The sales channel feature can be used in a variety of use cases including:
+
+- Implement a B2B Ecommerce Store.
+- Specifying different products for each channel you sell in.
+- Support Omnichannel in your ecommerce store.
+
+---
+
+## SalesChannel Entity Overview
+
+A sales channel is stored in the database as a [SalesChannel](../../../references/entities/classes/SalesChannel.md) entity. Some of its important attributes are:
+
+- `name`: The name of the sales channel.
+- `is_disabled`: A boolean value indicating of the Sales Channel is disabled or not.
+
+---
+
+## Relations to Other Entities
+
+### Store
+
+A store has a default sales channel. When you first run your Medusa server or seed your database, a default sales channel is created, if it doesn’t exist, and associated with the store.
+
+The relation is implemented in the [Store](../../../references/entities/classes/Store.md) entity. You can access the default sales channel of a store by expanding the `default_sales_channel` relation and using `store.default_sales_channel`. You can also access the ID of the default sales channel using `store.default_sales_channel_id`.
+
+### Product
+
+Products can be available in more than one sales channel. You can then filter products by a sales channel using the Storefront and Admin APIs.
+
+The relation is implemented in the [Product](../../../references/entities/classes/Product.md) entity. You can access the sales channels a product is available in by expanding the `sales_channels` relation and using `product.sales_channels`.
+
+### Cart
+
+When you create a cart, you can optionally specify the sales channel it belongs to. If you don’t set the sales channel, the store’s default sales channel will be associated with it.
+
+A cart can belong to only one sales channel. Only products that belong to the same sales channel as the cart can be added to it.
+
+The relation is implemented in the [Cart](../../../references/entities/classes/Cart.md) entity. You can access the sales channel a cart is associated with by expanding the `sales_channel` relation and using `cart.sales_channel`. You can also access the ID of the sales channel using `cart.sales_channel_id`.
+
+### Order
+
+Orders can optionally be associated with a sales channel. You can filter orders by a sales channel using the Storefront and Admin APIs.
+
+The relation is implemented in the [Order](../../../references/entities/classes/Order.md) entity. You can access the sales channel an order is associated with by expanding the `sales_channel` relation and using `order.sales_channel`. You can also access the ID of the sales channel using `order.sales_channel_id`.
+
+---
+
+## What’s Next 🚀
+
+- Check out the [Sales Channel’s Admin APIs](https://docs.medusajs.com/api/admin/#tag/Sales-Channel).

www/docs/sidebars.js

@@ -364,6 +364,10 @@ module.exports = {
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  id: "advanced/backend/price-selection-strategy/index"
  },
+ {
+ type: "doc",
+ id: "advanced/backend/sales-channels/index"
+ },
  ]
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  {