Defines the action to take when a contact with the same phone number,
email address, or external ID is found in the contact list.
Possible values:
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Update existing information: Update the existing contact with the information from the CSV file.
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Ignore: Skip the contact and do not import it.
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Create new contact: Create a new contact with the information from the CSV file, even if a contact with the same phone number, email address, or external ID already exists.