Does anyone know what the purpose is of the order attributes "ext_customer_id" and "ext_order_id"?
The Magento code appears to introduce these attributes and they appear on each order, but never actually used.
Judging by the name, I suspect they could be used to store the values of IDs from third-party systems (i.e. "ext_" being short for "external").
My aim is that when a new order is made, a customer attribute that I introduced previously to hold a third party ID, is copied into the order object. In this way, it can be output as part of a SOAP call to retrieve the order data, so I don't have to make a separate call to fetch customer information.
Could I, therefore, put my own IDs in these attributes, or would it be more prudent to create a new attribute for this purpose, just to be on the safe side? But if it already exists, why not use it, right?
This is more of a "best practices" question so anything in that regard would be appreciated.