Customer ID concept allows to assign a unique identifier to a customer thus allowing to tie multiple addresses to one identity. These might be several addresses from the same channel or from different channels. This allows to quarantine or to blacklist a customer rather than their single address.
Customer IDs are usually generated by your CRM internally. We require the Customer ID column as a mandatory column during import process.
Customer ID mapping
The first person to be invited will be tied to the Customer ID, e.g.
ID001 invited with address
email@example.com will create an association:
If you invite further customers in other imports with the same Customer ID, e.g. you invite
firstname.lastname@example.org with same Customer ID
ID001 this email will be appended to the existing association: