Placemark offers a REST API for map content. By default, maps are private to your organization and the API is disabled. However, you can enable the API - see the video on enabling and using the API for details.
https://api.placemark.io/api/v1/map/{mapid}/featurecollection
This API provides the contents of a map, as a GeoJSON FeatureCollection object. The map needs to be set as public in order for data to be returned.
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