Provider id of non-custom map?

[2012]

I would like to set an online overlay layer that i define in custom/providers.xml together with the Basemap Satellite map that is free in Locus store. If I had the provider id of the Basemap Satellite map I think I could do this with setting the background property for my map to that id. But how can I find out the provider id of a non-custom map?
I know I can let the user manually set my overlay layer as overlay and the other map as (background) map, but that is not really what I want to do.
Is this possible?

[Menion]

Good day,
unfortunately, due to the security of paid content, an ID of private maps remains private in app. Even if known, using them for the background of custom maps is still not possible, app refuses it. Thanks for understanding.

[2012]

I understand, no problem! It is important that relations with map providers are good.

But now at least I know it's not just because I'm not looking hard enough.