Customer Identifier Anonymization Flow through Vendor

This document outlines the Customer Identifier Anonymization Flow used by Cardlytics when integrating through a vendor. It explains how a clear-text customer identifier, such as a phone number, is securely hashed with a salt and stored, then used across SDK authentication, transaction processing, and reward fulfillment without exposing sensitive data. The flow ensures customer privacy while allowing vendors and publishers to consistently reference the same hashed identifier for lookups, redemptions, and rewards processing.