> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mercurjs.com/llms.txt
> Use this file to discover all available pages before exploring further.

# The store allowlist

> The product_seller link that controls which stores may sell a master product.

In this document, you'll learn how Mercur controls which stores are allowed to
sell a shared master product.

## Product seller

Since the catalog is shared, Mercur needs a way to say *which* stores may sell a
given master product. That's the **product–seller allowlist**: a many-to-many
link between Medusa's `Product` and Mercur's `Seller`, stored in the
`product_seller` table.

```ts theme={null}
const { data: products } = await query.graph({
  entity: "product",
  fields: ["id", "title", "sellers.id", "sellers.name"],
  filters: { id: "prod_123" },
})
```

A store appears in a product's `sellers` list only if it has been allowlisted.
Being on the allowlist is what lets a store create an
[offer](/platform/offer/overview) against the master product. Without it, the
store cannot list that product for sale.

<Note>
  The allowlist link is created automatically for the submitting store when a
  product is created with `seller_ids`, and managed afterwards with
  `linkSellersToProductWorkflow`. See
  [Allowlist stores](/platform/catalog/guides/allowlist-stores).
</Note>

## Category allowlist

Product categories carry the same pattern through the `category_seller` link. It
is a many-to-many association between `ProductCategory` and `Seller` that scopes
which categories a store is associated with. Manage it with
`linkSellersToProductCategoryWorkflow`.

<Tip>
  The allowlist governs the **right to sell**, not the sale itself. A store on
  the allowlist still has to create an offer to actually list the product.
  Allowlisting alone doesn't put anything on the storefront.
</Tip>