API documentation is publically available from the OpenSpace web site. From their site: OS OpenSpace is a free Ordnance Survey service that allows you to embed Ordnance Survey maps covering England, Scotland and Wales in your web apps. Place any kind of information that has a geographic reference on top of Ordnance Survey maps. Ordnance Survey is Great Britain's national mapping agency. The OS OpenSpace API is a piece of software code you can embed in your web application that provides all the necessary functionality to interact with a map, like panning, zooming in and out, and adding markers and polygons.
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