Explanation
To set up an XDM Individual Profile Schema for Adobe Journey Optimizer, the developer can use two identity fields for this process. An identity field is a field that uniquely identifies a customer entity and links it to their profile in Adobe Experience Platform. There are many types of identity fields that can be used, such as email, phone number, or cookie ID. However, two of the most common and recommended identity fields are CRMID and hashed email. CRMID is an identity field that stores a customer relationship management (CRM) identifier, such as Salesforce ID or Microsoft Dynamics ID. Hashed email is an identity field that stores a hashed version of a customer's email address, which provides more security and privacy than storing the plain textemail. XDM ID and campaign code are not identity fields, but other types of fields that can be used in an XDM Individual Profile Schema. XDM ID is a field that stores a system-generated identifier that is assigned to each profile in Adobe Experience Platform. Campaign code is a field that stores a code that identifies a marketing campaign that a customer has interacted with. References:
https://experienceleague.adobe.com/docs/experience-platform/xdm/home.html?lang=en#identity-fieldshttps://exp