+If you plan to create and update contacts in Cordial, define the `upsertContact` destination action. In addition to the `User Identities` field, the action defines the `Contact Attributes` field. This field defines an exclusive set of attributes that will be updated in a contact. Typically, you map them from Segment traits. For example, `customerId <- traits.customerId`. For the Cordial Classic destination, these mappings are stored in Cordial's database. In the Cordial (Actions) destination, they become explicit in the `upsertContact` destination action mappings.
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