Hi there,
I have checked the API guide and I will be happy to help you with that integration. The API uses OAuth2 authentication. We will create a Google Script that will connect to the API and import the bookings and the sales. In addition, we will deploy the script as a web app to be capable of receiving the webhooks from Bookeo.
I have worked on many similar projects, including using webhooks to integrate a Google Spreadsheet with Acuity scheduling. In addition to working with many APIs, like Slack, Trello, Hubspot, GeoOp and more. Kindly have a look at my profile, all of my reviews are related to Google Apps Scripting.
I will be happy to address any of your questions!
Sincerely,
Mohamed