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Headless Server Developer Manual / Version 2201
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The Headless Server does not provide access to purely commerce data directly. Instead the schema includes the types CategoryRef and ProductRef, which represent a link to a category or a product respectively. Links from CMS contents to commerce objects can be accessed via a productRef for content of type CMExternalProduct or categoryRef for content of type CMExternalChannel.

{
  content {
    content(id: "3240") {
      ...on CMExternalProduct {
        repositoryPath
        productRef {
          externalId
          locale
          storeId
        }
      }
    }
  }
}

The CategoryRef can be used to be resolved externally into a category, the ProductRef can be resolved into a product. This can be done via schema stitching or directly within a headless client application.

For example a product list query would look like this:

{
    content {
    content(id: "850") {
      ... on CMProductList {
        items {
          ... on CMTeasable {
            teaserTitle
          }
          ... on CommerceRef {
            externalId
            storeId
            locale
          }
        }
      }
    }
  }
}

And here the data retrieved:

{
  "data": {
    "content": {
      "content": {
        "items": [
          {
            "externalId": "AuroraWMDRS-1",
            "storeId": "1",
            "locale": "en-US"
          },
          {
            "externalId": "AuroraWMDRS-4",
            "storeId": "1",
            "locale": "en-US"
          },
          {
            "teaserTitle": "Find your personal style"
          },
          {
            "teaserTitle": "Editorial Blog"
          },
          {
            "externalId": "AuroraWMDRS-23",
            "storeId": "1",
            "locale": "en-US"
          },
          {
            "externalId": "AuroraWMDRS-24",
            "storeId": "1",
            "locale": "en-US"
          }
        ]
      }
    }
}

A CommerceRef includes the data needed to load the product itself from the commerce system again.

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