# How to get cross-references for a place
<a name="how-to-get-place-cross-references"></a>

Use `CrossReferences` in the `AdditionalFeatures` parameter to retrieve third-party supplier identifiers for a place. This enables you to correlate the place with entries in external systems such as Yelp and TripAdvisor.

## Potential use cases
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+ **Review aggregation:** Link a place to its profile on review platforms to display user ratings.
+ **Data reconciliation:** Match place records across your internal systems and third-party databases.

## Examples
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### Look up cross-references by place ID
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------
#### [ Sample request ]

```
https://places.geo.eu-central-1.amazonaws.com/v2/place/YourPlaceId?additional-features=CrossReferences&key=Your_Key
```

------
#### [ Sample response ]

```
{
    "PlaceId": "<Redacted>",
    "PlaceType": "PointOfInterest",
    "Title": "Space Needle, Seattle, WA, United States",
    "CrossReferences": [
        {
            "Source": "TripAdvisor",
            "SourcePlaceId": "d104410",
            "SourceCategories": [
                {
                    "Id": "400-4000-4580",
                    "Name": "Landmark-Attraction"
                }
            ]
        },
        {
            "Source": "Yelp",
            "SourcePlaceId": "space-needle-seattle",
            "SourceCategories": [
                {
                    "Id": "400-4000-4580",
                    "Name": "Landmark-Attraction"
                }
            ]
        }
    ]
}
```

------
#### [ cURL ]

```
curl --request GET \
  --url 'https://places.geo.eu-central-1.amazonaws.com/v2/place/YourPlaceId?key=Your_Key&additional-features=CrossReferences'
```

------
#### [ AWS CLI ]

```
aws geo-places get-place --key ${YourKey} --place-id "YourPlaceId" --additional-features CrossReferences
```

------

## Developer tips
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+ To use the returned identifiers, refer to the supplier's API documentation. For example, see the [Yelp Places API](https://docs.developer.yelp.com/docs/places-intro) on the Yelp website or the [Tripadvisor Content API](https://docs.terra.tripadvisor.com/docs/overview) on the Tripadvisor website.