Letting the end-user provide the key

If you take no special steps, Lucy will ask the user for a key the first time the user tries to load Bing Maps data. This key will be stored by Lucy so that the user only needs to provide it once.

Creating an application with a hard-coded Bing Maps key

If you want to provide an application to the end-user which includes a Bing Maps key, you configure it in the configuration file 

resources\lucy\bingmaps\TLcyBingMapsAddOn.cfg

as the value of the applicationID property.

See How to obtain a Bing Maps key for more information on how to obtain a key.