How is data from separate eBay store integrations kept separate?

Your data will be tagged with the "Title" of your integrations. To check the titles of your integrations, click the "Integrations" tab. This menu will show all your current integrations and their titles.

When data is imported, it will have these titles associated with it. Sales and Returns will have it in the "Sale Platform" field, expenses will have it in the "Bank Account" field, and inventory will have it in the "Platforms Listed" field.