Some apps will need to maintain their own copy of product data. Shopify provides several tools to make this possible.

## Webhooks

Subscribe to [webhooks](/docs/apps/build/webhooks) to be notified of product changes. The webhook payload will include the updated product data.

The `PRODUCTS_*` webhook topics send notifications for all products. The `PRODUCT_LISTINGS_*` webhook topics only send notifications for products that are published to a channel app. For a complete list of webhook topics, refer to the [GraphQL Admin API](/docs/api/admin-graphql/latest/enums/WebhookSubscriptionTopic).

### Product feeds

A common use case for using product feed webhooks is for creating external copies of all products that are published to your sales channel. product feed webhooks are similar to the `product_listings/*` webhooks in that they will only send notifications for products that are published to a channel app, but product feed payloads are formatted for a specific country and language. You can also initiate a "full sync", which will cause a webhook notification to be sent for every published product.

Learn about [integration details](/docs/apps/build/sales-channels/contextual-product-feeds).

## APIs

While webhooks push data to subscribers as changes occur, it's also possible to pull data on demand using Shopify's API's. The [GraphQL Admin API](/docs/api/admin-graphql) is useful for building integrations that interact with a store's back end, while the [Storefront API](/docs/api/storefront) provides data more suited for buyer-facing integrations.

> Note:
> It's important to consider [rate limits](/docs/api/usage/rate-limits) when choosing an API. Also, make sure you have the correct [access scopes](/docs/api/usage/access-scopes). The Admin API requires the `read_product_listings` scope, and the Storefront API requires the `unauthenticated_read_product_listings`

## Bulk operations

You can also use a [bulk operation query](/docs/api/usage/bulk-operations/queries) to download a complete copy of product data.