Before keep reading this article, check if you already know the concept below:

We recommend that you only use our API Connection with Airbnb, as it is a jointly developed solution between our teams and you will have more support.

Regarding the iCal connection with Airbnb, you should only use if there was something that does not suit you in the API Connection between Stays and Airbnb.

How to connect with Airbnb via iCal?