Global Mapper v25.0

How to load API Map Servers

I am new to GM and what I am trying to do is view my companies 'C Maps' which are provided via a URL with an API Key.

I have tried all the options available via the 'Select Online Data Source to Download - Add New Source' (such as TMS, WCS, WFS etc.) but to date I have been unsuccessful. What I don't see is any of the options asking for the actual API key.

If it's any help, what I am trying to do is the same as adding 'XYZ Tiles - New Connection' in QGIS!!

Any help would be great.

Thanks, Tim