Syncing events between Google Calendar and a webcal calendar with callin.io

Hello everyone, 

I am developing an AI receptionist that integrates with Google Calendar to check availability for booking jobs or appointments. 

We utilize a CRM called ServiceM8 for booking jobs. It offers the capability to connect to an external Google Calendar via a webcal link. If I make a booking in Google Calendar, it prevents my CRM from scheduling a job at that specific time.

The challenge is that the webcal data isn't merged into the primary Google Calendar; it remains a separate calendar. When testing my AI with a Google Calendar plugin, it appears to allow users to book appointments on days that already have a job scheduled.

It seems the Google Calendar plugin only considers data from the primary calendar and not the webcal data (unless the webcal data lacks a busy or free status). I'm uncertain if webcal data includes a "busy" or "free" status, or if this is an adjustable option, so I assume it cannot be modified.

I have successfully cloned the webcal data and inserted it into my primary calendar, marking the events as "busy," which works perfectly. However, the issue arises when I edit or cancel a job, as it doesn't update my primary calendar. (I only make edits within the CRM.)

Based on my research, this might be achievable using Google Sheets and checking ID numbers.

Could someone provide detailed assistance on how this could be implemented?

In summary, I need to clone events from Calendar A (a webcal linked to Google Calendar) to primary Calendar B or another calendar account. Crucially, if an event in Calendar A is deleted or its time/day is modified, Calendar B needs to be updated accordingly. 

Thanks