I am currently working on an app where I want to add an event to the outlook calendar when making a booking. I have searched around and I was not able to find any proper guide to help me.
My question is: how can I integrate the outlook calendar into my flutter app.
You can use MS Graph for getting this implemented, see Create event for more information. Use this API to create a new event in a calendar. The calendar can be one for a user, or the default calendar of a Microsoft 365 group. You may find the sample code in the Create calendar event using Microsoft Graph Client thread.