Ideally, the project should be integrated into your existing ERP and equipped with interfaces for financial accounting. There are various approaches first that of the pure order list, that will be scanned and packed by one of your employees at the cash register, up to the integration of the stores as an extra into your POS system to an automated data exchange via API and other interfaces. The processing of loyalty cards (The 1 Card) can be integrated too. A transfer of data from the Online Shop to a data warehouse / BI system is obvious and can also be implemented in various ways.
To start, we suggest that the project will be initially established in a selected region to a market and then extended to other regions and markets. Even in the initial phase only selected products should be integrated.