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Welcome to the yii2-openlayers-maps wiki!
The OpenLayers is a free map. You don't need to buy API key to use it.
You can create one or more maps in one page. In the map you can create one or more markers.
My extension has a free geocoding to set map or marker position by address. OpenLayers don't has geocoding, so I use Nominatim search engine.
Sadly this search engine allowed 1 request per second so if you want use many addresses, it will take several minutes. You can read more about this rule here.
This widget can use Bing Maps too. If you want to use it, you need Bing Map api key. For more information choose Bing Maps in the wiki.