Important: If you plan to integrate Adobe Business Catalyst with any of the accounting systems it is recommended that you first create a shipping item in your accounting system and then connect your accounting system to OneSaas before connecting Adobe Business Catalyst.
Read our guides on how to create the shipping item and how to connect your account system:

OneSaas will login to your Adobe Business Catalyst website and provision API access for the user, read the SiteId and provision the integration.