When setting up multiple calendars, you need to obtain each Google calendar ID and a Google Calendar API Key to access the calendar.
In the short code, the Google Calendar ID is specified by g_id.
The Google Calendar API Key is set with g_api_key.
The following is an example of a shortcode for a case where there are 5 IDs.
g_id_1=”Google Calendar ID(A)” g_id_2=”Google Calendar ID(B)” g_id_3=”Google Calendar ID(C)” g_id_4=”Google Calendar ID(D)” g_id_5=”Google Calendar ID(E)”
If you use a common API, there is a limit to the number of APIs that can be processed, so if you get an error that cannot be processed, please get an API for each calendar.
In this case, the following is an example configuration.
g_api_key_1=”Google Calendar API Key(A)” g_api_key_2=”Google Calendar API Key(B)” g_api_key_3=”Google Calendar API Key(C)” g_api_key_4=”Google Calendar API Key(D)” g_api_key_5=”Google Calendar API Key(E)”
[How to get each of these is explained below]
https://info.cseas.kyoto-u.ac.jp/en/links-en/plugin-en/wordpress-dev-info-en/google-calendar-list-view
Here is an excerpt from the relevant section of the above link.
How to create Google Calendar API Key
Creating Google API Key
https://docs.simplecalendar.io/google-api-key/?utm_source=inside-plugin&utm_medium=link&utm_campaign=core-plugin&utm_content=settings-link (Simple Calendar Documentation)
How to find Google Calendar ID
Finding Your Google Calendar ID
https://docs.simplecalendar.io/find-google-calendar-id/ (Simple Calendar Documentation)