Although you may access the `/products/search.json` endpoint through your Shopify admin, it is not available through the public REST Admin API.
In order to search for products with the API, we recommend using GraphQL which allows you to query products by many parameters including tag, inventory total, and SKU. The complete list can be found in our documentation.
As mentioned above, the `admin/products/search.json` endpoint is not accessible through the Admin REST API. I would recommend using the GraphQL API to conduct search queries on the ProductConnection.
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