When calling the map layer service, a license Key is required. You can log in to the The official website of Sky Map to apply for a license. The specific steps are as follows:

1. Click "Development Resources-> Map API" to enter the map API related webpage.

   

2. Click "Application Key", complete personal registration according to the prompt, and enter the official website after successful application.

   

   

3. After the user logs in successfully, click "Console" in the upper right corner to open the application management interface. You can create your own application in this interface and apply for your own license.

   

4. Click Create New Application and select Browser as the application type. You can fill in and submit the application by referring to the following figure.

   

5. After submission, a license Key will be automatically assigned to the application, and the Key can be copied and saved locally to facilitate future calls.
6. When calling the map layer service on the desktop, enter the requested Key in the key box.