JOSM - Add Tracestrack Topo map layer to app

Wanted to add Tracestrack Topo in JOSM to the Imagery layers and found some discussion at ticket 23226 on the matter and code that was added to wikiMaps page which includes a codeline link. It looks like it’s to work as a TMS, but can’t get it to function, no tiles are being pulled and might relate to the apikey that needs insertion at the end.
https://tile.tracestrack.com/topo__/{zoom}/{x}/{y}@1x.png?key={apikey}

On the OSM site it simply says as url suffix ‘layer=P’, which does not make me any the wiser.

Does anyone know what that apikey code is to put in or where to extract it from? (Maybe not a good idea to advertise it to the world).

It’s available in the list of default entries, just need to add it from there. The API key is likely included at build time so you don’t have to provide your own.

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Great, albeit see no diff in the line I put in and the one that is in the pick list, so it must be something behind the scenes. It works, so resolved.

TU