Base path /tiles/ on https://gw.taxiaddis.com.
Authenticate with the X-API-Key header.
Tiles are billed per 1,000. Tile layers cannot set headers, so pass the key as
?api_key=.
<img src="https://gw.taxiaddis.com/tiles/12/2412/1580.png?api_key=tak_live_xxx">
// Leaflet tile layer:
L.tileLayer('https://gw.taxiaddis.com/tiles/{z}/{x}/{y}.png?api_key=tak_live_xxx').addTo(map);