Determine the data for the contact identifier
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Before you can start to map your custom contact identifier data, you must determine some basic settings for the identifier.
Every contact identifier has the following values:
| Source | This value describes the system that the identifier comes from. In this example, the source will be Loyalty.Program. |
| Identifier | This is the actual identifier from the external system. In this example, you will use the same value used for the membership id on the contact facet. |
| Identifier type | Since you are using the membership id for the contact identifier value, and the membership id is associated with a known contact, this value will be ContactIdentifierType.Known. |
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